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x in (-oo:+oo)
-4*x = -2/5 // + -2/5
-4*x-(-2/5) = 0
2/5-4*x = 0
2/5-4*x = 0 // - 2/5
-4*x = -2/5 // : -4
x = -2/5/(-4)
x = 1/10
x = 1/10
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