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d in (-oo:+oo)
-91 = 6*d+6*d+5 // - 6*d+6*d+5
-(6*d)-(6*d)-91-5 = 0
-6*d-6*d-91-5 = 0
-12*d-96 = 0 // + 96
-12*d = 96 // : -12
d = 96/(-12)
d = -8
d = -8
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