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-10x+3 = -x+12 -10x+x = 12-3 -9x = 9 x = -1
7x+3=10x-9(shift +3 & 10x) 7x-10x=-9-3(signs changed) -3x=-12(divide both sides by -3) x=4
10x+2=12 10x=10 x=1
6-x+12 = 10x+7 6+12-7 = 10x+x 11 = 11x x = 1
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