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x in (-oo:+oo)
(3/4)*x-1 = (7/8)*x // - (7/8)*x
(3/4)*x-((7/8)*x)-1 = 0
(3/4)*x+(-7/8)*x-1 = 0
-1/8*x-1 = 0 // + 1
-1/8*x = 1 // : -1/8
x = 1/(-1/8)
x = -8
x = -8
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