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d in (-oo:+oo)
-(3*d)-5/6 = -59/6 // + -59/6
-(3*d)-5/6-(-59/6) = 0
59/6-3*d-5/6 = 0
9-3*d = 0 // - 9
-3*d = -9 // : -3
d = -9/(-3)
d = 3
d = 3
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