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x in (-oo:+oo)
(4/5)*x = -83/5 // + -83/5
(4/5)*x-(-83/5) = 0
(4/5)*x+83/5 = 0
4/5*x+83/5 = 0 // - 83/5
4/5*x = -83/5 // : 4/5
x = -83/5/4/5
x = -83/4
x = -83/4
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