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X in (-oo:+oo)
(3/4)*X-6 = (7/8)*X // - (7/8)*X
(3/4)*X-((7/8)*X)-6 = 0
(3/4)*X+(-7/8)*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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