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(1/2)*(12*x-4)-x+7 = 0
1/2*(12*x-4)-x+7 = 0
1/2*(12*x-4)-x+7 = 0
5*x-2+7 = 0
5*x+5 = 0
5*x+5 = 0
5*x+5 = 0 // - 5
5*x = -5 // : 5
x = -5/5
x = -1
x = -1
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