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(1/2)*(x-6) = 18 // - 18
(1/2)*(x-6)-18 = 0
1/2*(x-6)-18 = 0
1/2*(x-6)-18 = 0
1/2*x-21 = 0
1/2*x-21 = 0
1/2*x-21 = 0 // + 21
1/2*x = 21 // : 1/2
x = 21/1/2
x = 42
x = 42
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