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(1/2)*(2*x-10) = 4 // - 4
(1/2)*(2*x-10)-4 = 0
1/2*(2*x-10)-4 = 0
1/2*(2*x-10)-4 = 0
x-9 = 0
x-9 = 0
x-9 = 0 // + 9
x = 9
x = 9
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