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d in (-oo:+oo)
-2*d-(3/7) = -(5*d)-54/77 // + -(5*d)-54/77
5*d-2*d-(3/7)-(-54/77) = 0
5*d-2*d-3/7+54/77 = 0
3*d+3/11 = 0 // - 3/11
3*d = -3/11 // : 3
d = -3/11/3
d = -1/11
d = -1/11
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