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x in (-oo:+oo)
(1/2)*x-6 = (5/8)*x // - (5/8)*x
(1/2)*x-((5/8)*x)-6 = 0
(1/2)*x+(-5/8)*x-6 = 0
-1/8*x-6 = 0 // + 6
-1/8*x = 6 // : -1/8
x = 6/(-1/8)
x = -48
x = -48
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