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x in (-oo:+oo)
(2/5)*x-((5/2)*x) = 1/15 // - 1/15
(2/5)*x-((5/2)*x)-(1/15) = 0
(2/5)*x+(-5/2)*x-1/15 = 0
-21/10*x-1/15 = 0 // + 1/15
-21/10*x = 1/15 // : -21/10
x = 1/15/(-21/10)
x = -2/63
x = -2/63
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