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x in (-oo:+oo)
(-2/5)*x = 1/15 // - 1/15
(-2/5)*x-(1/15) = 0
(-2/5)*x-1/15 = 0
-2/5*x-1/15 = 0 // + 1/15
-2/5*x = 1/15 // : -2/5
x = 1/15/(-2/5)
x = -1/6
x = -1/6
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