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x in (-oo:+oo)
(1/4)*x-((3/8)*x) = 2 // - 2
(1/4)*x-((3/8)*x)-2 = 0
(1/4)*x+(-3/8)*x-2 = 0
-1/8*x-2 = 0 // + 2
-1/8*x = 2 // : -1/8
x = 2/(-1/8)
x = -16
x = -16
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