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x in (-oo:+oo)
(2/5)*x = -8/15 // + -8/15
(2/5)*x-(-8/15) = 0
(2/5)*x+8/15 = 0
2/5*x+8/15 = 0 // - 8/15
2/5*x = -8/15 // : 2/5
x = -8/15/2/5
x = -4/3
x = -4/3
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