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d in (-oo:+oo)
-91 = 8-5*d-(4*d) // - 8-5*d-(4*d)
4*d-(-5*d)-91-8 = 0
5*d+4*d-91-8 = 0
9*d-99 = 0 // + 99
9*d = 99 // : 9
d = 99/9
d = 11
d = 11
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