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