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x in (-oo:+oo)
-(2*x)-1 = 5/12 // - 5/12
-(2*x)-(5/12)-1 = 0
-2*x-5/12-1 = 0
-2*x-17/12 = 0 // + 17/12
-2*x = 17/12 // : -2
x = 17/12/(-2)
x = -17/24
x = -17/24
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