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x in (-oo:+oo)
-x-(1/5) = x+1/2+1/5 // - x+1/2+1/5
-x-x-(1/5)-(1/2)-(1/5) = 0
-x-x-1/5-1/2-1/5 = 0
-2*x-9/10 = 0 // + 9/10
-2*x = 9/10 // : -2
x = 9/10/(-2)
x = -9/20
x = -9/20
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