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d in (-oo:+oo)
-(2*d)-10 = -11 // + 11
11-(2*d)-10 = 0
11-2*d-10 = 0
1-2*d = 0 // - 1
-2*d = -1 // : -2
d = -1/(-2)
d = 1/2
d = 1/2
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