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x in (-oo:+oo)
(3/4)*x-(1/8) = 3*x // - 3*x
(3/4)*x-(3*x)-(1/8) = 0
(3/4)*x-3*x-1/8 = 0
-9/4*x-1/8 = 0 // + 1/8
-9/4*x = 1/8 // : -9/4
x = 1/8/(-9/4)
x = -1/18
x = -1/18
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