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            <video:description>Pour résoudre une équation de la forme x+a=b, il suffit de soustraire a aux deux membres de l&#39;équation.  Par exemple, si x + 5 = 54, on soustrait  5 aux deux membres et on obtient x = 49. Il ne faut pas oublier de vérifier son résultat en remplaçant x dans l’équation initiale par la valeur numérique trouvée et en obtenant une égalité vraie.</video:description>
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            <video:title>Pourquoi soustraire la même chose dans les deux membres d&#39;une équation </video:title>
            <video:description>Dans ce problème mathématique amusant, nous avons une balance équilibrée avec un poids mystérieux d&#39;un côté et plusieurs poids d&#39;un kilogramme de l&#39;autre. Pour trouver la masse du poids mystère, nous enlevons le même nombre de poids de 1 kilogramme des deux côtés, tout en gardant la balance équilibrée. Nous pouvons alors facilement déterminer la masse du poids mystère.</video:description>
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            <video:description>Apprenons maintenant à résoudre une équation simple de la forme ax=b. Une égalité reste vraie lorsque l&#39;on divise chacun de ses membres par un même nombre non nul. Par exemple, l&#39;équation à résoudre est 7x = 14. Pour isoler la variable x, que faut-il faire pour neutraliser la multiplication par 7 ? Tout simplement, diviser les deux membres par 7.</video:description>
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            <Attribute name="description">Apprenons maintenant à résoudre une équation simple de la forme x/a=b. Une égalité reste vraie lorsque l&#39;on mulitplie chacun de ses membres par un même nombre non nul. Par exemple, l&#39;équation à résoudre est x/3 = 14. Pour isoler la variable x, que faut-il faire pour neutraliser la division par 3 ? Tout simplement, multiplier les deux membres par 3.</Attribute>
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            <video:title>Une équation simple de la forme x/a = b </video:title>
            <video:description>Apprenons maintenant à résoudre une équation simple de la forme x/a=b. Une égalité reste vraie lorsque l&#39;on mulitplie chacun de ses membres par un même nombre non nul. Par exemple, l&#39;équation à résoudre est x/3 = 14. Pour isoler la variable x, que faut-il faire pour neutraliser la division par 3 ? Tout simplement, multiplier les deux membres par 3.</video:description>
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            <video:category>Équations à résoudre en une seule étape</video:category>
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