X- (-2X+5X) + (7X-4X)
Com contas por favor *-*
x-(-2x+5x) + (7x+4x)
x+2x-5x+7x+4x
14x-5x
9x
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x-(-2x+5x) + (7x+4x)
x+2x-5x+7x+4x
14x-5x
9x