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(1/2)*(x-20) = 2 // - 2
(1/2)*(x-20)-2 = 0
1/2*(x-20)-2 = 0
1/2*(x-20)-2 = 0
1/2*x-12 = 0
1/2*x-12 = 0
1/2*x-12 = 0 // + 12
1/2*x = 12 // : 1/2
x = 12/1/2
x = 24
x = 24
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