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d in (-oo:+oo)
-(2*d)-7 = -11 // + 11
11-(2*d)-7 = 0
11-2*d-7 = 0
4-2*d = 0 // - 4
-2*d = -4 // : -2
d = -4/(-2)
d = 2
d = 2
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