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