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x in (-oo:+oo)
(4/5)*x = -(8/5) // + 8/5
(4/5)*x+8/5 = 0
4/5*x+8/5 = 0 // - 8/5
4/5*x = -8/5 // : 4/5
x = -8/5/4/5
x = -2
x = -2
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