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(1/2)*(2*x-1) = 4 // - 4
(1/2)*(2*x-1)-4 = 0
1/2*(2*x-1)-4 = 0
1/2*(2*x-1)-4 = 0
x-9/2 = 0
x-9/2 = 0
x-9/2 = 0 // + 9/2
x = 9/2
x = 9/2
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