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d in (-oo:+oo)
-(4*d)-1/4 = 3*d-(235/44) // - 3*d-(235/44)
235/44-(4*d)-(3*d)-1/4 = 0
235/44-4*d-3*d-1/4 = 0
56/11-7*d = 0 // - 56/11
-7*d = -56/11 // : -7
d = -56/11/(-7)
d = 8/11
d = 8/11
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