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x in (-oo:+oo)
(1/2)*x-3 = (3/4)*x // - (3/4)*x
(1/2)*x-((3/4)*x)-3 = 0
(1/2)*x+(-3/4)*x-3 = 0
-1/4*x-3 = 0 // + 3
-1/4*x = 3 // : -1/4
x = 3/(-1/4)
x = -12
x = -12
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