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x in (-oo:+oo)
(7/8)*x = (4/8)*x+(6/8)*x // - (4/8)*x+(6/8)*x
(7/8)*x-((4/8)*x)-((6/8)*x) = 0
(7/8)*x+(-1/2)*x+(-3/4)*x = 0
-3/8*x = 0 // : -3/8
x = 0
x = 0
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