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(1/2)*(x-3) = 12 // - 12
(1/2)*(x-3)-12 = 0
1/2*(x-3)-12 = 0
1/2*(x-3)-12 = 0
1/2*x-27/2 = 0
1/2*x-27/2 = 0
1/2*x-27/2 = 0 // + 27/2
1/2*x = 27/2 // : 1/2
x = 27/2/1/2
x = 27
x = 27
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