Tìm x 2-x=15-(-5) x-12=(-9)-15 9-25=(7-x)-(25+7) 4x-10=15-x -12+x=5x-20 3x+(-21=12-8x) 125:(3x-13)=25 3(2x-5)-3(x+7)=14 113(x-4)-(8-x)=2

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