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d in (-oo:+oo)
-29 = 6*d-(3*d)-2 // - 6*d-(3*d)-2
3*d-(6*d)-29+2 = 0
3*d-6*d-29+2 = 0
-3*d-27 = 0 // + 27
-3*d = 27 // : -3
d = 27/(-3)
d = -9
d = -9
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