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x in (-oo:+oo)
-x-(4/5) = x+1/6+1/5 // - x+1/6+1/5
-x-x-(4/5)-(1/6)-(1/5) = 0
-x-x-4/5-1/6-1/5 = 0
-2*x-7/6 = 0 // + 7/6
-2*x = 7/6 // : -2
x = 7/6/(-2)
x = -7/12
x = -7/12
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