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x in (-oo:+oo)
-x-(4/5) = x+1/2+2/5 // - x+1/2+2/5
-x-x-(4/5)-(1/2)-(2/5) = 0
-x-x-4/5-1/2-2/5 = 0
-2*x-17/10 = 0 // + 17/10
-2*x = 17/10 // : -2
x = 17/10/(-2)
x = -17/20
x = -17/20
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