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x in (-oo:+oo)
-x-(2/5) = x+1/4+1/5 // - x+1/4+1/5
-x-x-(2/5)-(1/4)-(1/5) = 0
-x-x-2/5-1/4-1/5 = 0
-2*x-17/20 = 0 // + 17/20
-2*x = 17/20 // : -2
x = 17/20/(-2)
x = -17/40
x = -17/40
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