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x in (-oo:+oo)
(1/4)*x-(1/2) = 12 // - 12
(1/4)*x-(1/2)-12 = 0
(1/4)*x-1/2-12 = 0
1/4*x-25/2 = 0 // + 25/2
1/4*x = 25/2 // : 1/4
x = 25/2/1/4
x = 50
x = 50
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