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(1/2)*(2*x-4) = 8 // - 8
(1/2)*(2*x-4)-8 = 0
1/2*(2*x-4)-8 = 0
1/2*(2*x-4)-8 = 0
x-10 = 0
x-10 = 0
x-10 = 0 // + 10
x = 10
x = 10
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