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x in (-oo:+oo)
(3/8)*x-((1/2)*x) = 5 // - 5
(3/8)*x-((1/2)*x)-5 = 0
(3/8)*x+(-1/2)*x-5 = 0
-1/8*x-5 = 0 // + 5
-1/8*x = 5 // : -1/8
x = 5/(-1/8)
x = -40
x = -40
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