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x in (-oo:+oo)
(1/4)*x-((3/8)*x) = 4 // - 4
(1/4)*x-((3/8)*x)-4 = 0
(1/4)*x+(-3/8)*x-4 = 0
-1/8*x-4 = 0 // + 4
-1/8*x = 4 // : -1/8
x = 4/(-1/8)
x = -32
x = -32
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