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