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(1/2)*(2*x-6) = 6 // - 6
(1/2)*(2*x-6)-6 = 0
1/2*(2*x-6)-6 = 0
1/2*(2*x-6)-6 = 0
x-9 = 0
x-9 = 0
x-9 = 0 // + 9
x = 9
x = 9
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