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(1/2)*(2*x-9) = 7 // - 7
(1/2)*(2*x-9)-7 = 0
1/2*(2*x-9)-7 = 0
1/2*(2*x-9)-7 = 0
x-23/2 = 0
x-23/2 = 0
x-23/2 = 0 // + 23/2
x = 23/2
x = 23/2
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