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x in (-oo:+oo)
(7/8)*x = 4/(-5) // - 4/(-5)
(7/8)*x-(4/(-5)) = 0
(7/8)*x+4/5 = 0
7/8*x+4/5 = 0 // - 4/5
7/8*x = -4/5 // : 7/8
x = -4/5/7/8
x = -32/35
x = -32/35
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