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x in (-oo:+oo)
(1/4)*x-((3/4)*x) = 3 // - 3
(1/4)*x-((3/4)*x)-3 = 0
(1/4)*x+(-3/4)*x-3 = 0
-1/2*x-3 = 0 // + 3
-1/2*x = 3 // : -1/2
x = 3/(-1/2)
x = -6
x = -6
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