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d in (-oo:+oo)
11 = 2*d-6*d+7 // - 2*d-6*d+7
11-(-6*d)-(2*d)-7 = 0
6*d-2*d-7+11 = 0
4*d+4 = 0 // - 4
4*d = -4 // : 4
d = -4/4
d = -1
d = -1
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