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d in (-oo:+oo)
-(3*d)-6 = 4*d-69 // - 4*d-69
69-(3*d)-(4*d)-6 = 0
69-3*d-4*d-6 = 0
63-7*d = 0 // - 63
-7*d = -63 // : -7
d = -63/(-7)
d = 9
d = 9
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