Réduire:
9b - 7b + b
= 2b + b
= 3b
8x - 2 + 5x + 8
= 8x + 5x - 2 + 8
= 13x + 6
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Réduire:
9b - 7b + b
= 2b + b
= 3b
8x - 2 + 5x + 8
= 8x + 5x - 2 + 8
= 13x + 6