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