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6x-6 = 6x+18
6x -6x = 18+6
0 = 24
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3(4x+7)=x-25
12x +21 = x-25
12x-x = -25-21
11x = -46
X = -46/11
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7x+15=3(3x-7)
7x +15 = 9x-21
7x-9x = -21-15
-2x = -36
X = -36/-2
X = 18