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