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x in (-oo:+oo)
(-2/5)*x = -4/25 // + -4/25
(-2/5)*x-(-4/25) = 0
(-2/5)*x+4/25 = 0
4/25-2/5*x = 0 // - 4/25
-2/5*x = -4/25 // : -2/5
x = -4/25/(-2/5)
x = 2/5
x = 2/5
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