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x in (-oo:+oo)
(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-25/2 = 0
1/2*x-25/2 = 0
1/2*x-25/2 = 0 // + 25/2
1/2*x = 25/2 // : 1/2
x = 25/2/1/2
x = 25
x = 25
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