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Comment simplifier (10x-8y)-(4y+×)+12y=

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Bonjour;

(10x - 8y) - (4y + x) + 12y

= 10x - 8y - 4y - x + 12y

= 10x - x - 8y - 4y + 12y

= 9x - 12y + 12y

= 9x .