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x in (-oo:+oo)
4/5 = (-5/8)*x // - (-5/8)*x
4/5-((-5/8)*x) = 0
(5/8)*x+4/5 = 0
5/8*x+4/5 = 0 // - 4/5
5/8*x = -4/5 // : 5/8
x = -4/5/5/8
x = -32/25
x = -32/25
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