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x in (-oo:+oo)
(1/4)*x-(1/8) = 3 // - 3
(1/4)*x-(1/8)-3 = 0
(1/4)*x-1/8-3 = 0
1/4*x-25/8 = 0 // + 25/8
1/4*x = 25/8 // : 1/4
x = 25/8/1/4
x = 25/2
x = 25/2
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