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x in (-oo:+oo)
(4/5)*x = -5/8 // + -5/8
(4/5)*x-(-5/8) = 0
(4/5)*x+5/8 = 0
4/5*x+5/8 = 0 // - 5/8
4/5*x = -5/8 // : 4/5
x = -5/8/4/5
x = -25/32
x = -25/32
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