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d in (-oo:+oo)
-(5*d)-6 = -3*d-(84/11) // + -3*d-(84/11)
84/11-(5*d)-(-3*d)-6 = 0
3*d-5*d+84/11-6 = 0
18/11-2*d = 0 // - 18/11
-2*d = -18/11 // : -2
d = -18/11/(-2)
d = 9/11
d = 9/11
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