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x in (-oo:+oo)
(4/5)*x = -31/15 // + -31/15
(4/5)*x-(-31/15) = 0
(4/5)*x+31/15 = 0
4/5*x+31/15 = 0 // - 31/15
4/5*x = -31/15 // : 4/5
x = -31/15/4/5
x = -31/12
x = -31/12
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