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