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(1/2)*(2*x-9) = 8 // - 8
(1/2)*(2*x-9)-8 = 0
1/2*(2*x-9)-8 = 0
1/2*(2*x-9)-8 = 0
x-25/2 = 0
x-25/2 = 0
x-25/2 = 0 // + 25/2
x = 25/2
x = 25/2
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