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x in (-oo:+oo)
(1/2)*x-4 = (3/4)*x // - (3/4)*x
(1/2)*x-((3/4)*x)-4 = 0
(1/2)*x+(-3/4)*x-4 = 0
-1/4*x-4 = 0 // + 4
-1/4*x = 4 // : -1/4
x = 4/(-1/4)
x = -16
x = -16
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