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x in (-oo:+oo)
-x-(4/5) = x+1/4+1/5 // - x+1/4+1/5
-x-x-(4/5)-(1/4)-(1/5) = 0
-x-x-4/5-1/4-1/5 = 0
-2*x-5/4 = 0 // + 5/4
-2*x = 5/4 // : -2
x = 5/4/(-2)
x = -5/8
x = -5/8
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