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x in (-oo:+oo)
8 = (-4/5)*x // - (-4/5)*x
8-((-4/5)*x) = 0
(4/5)*x+8 = 0
4/5*x+8 = 0 // - 8
4/5*x = -8 // : 4/5
x = -8/4/5
x = -10
x = -10
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