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(1/2)*(4*x+2)-x = 12 // - 12
(1/2)*(4*x+2)-x-12 = 0
1/2*(4*x+2)-x-12 = 0
1/2*(4*x+2)-x-12 = 0
x-12+1 = 0
x-11 = 0
x-11 = 0
x-11 = 0 // + 11
x = 11
x = 11
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