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(1/2)*(x+1) = 12 // - 12
(1/2)*(x+1)-12 = 0
1/2*(x+1)-12 = 0
1/2*(x+1)-12 = 0
1/2*x-23/2 = 0
1/2*x-23/2 = 0
1/2*x-23/2 = 0 // + 23/2
1/2*x = 23/2 // : 1/2
x = 23/2/1/2
x = 23
x = 23
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