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