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d in (-oo:+oo)
3*d-2 = 6*d+19 // - 6*d+19
3*d-(6*d)-19-2 = 0
3*d-6*d-19-2 = 0
-3*d-21 = 0 // + 21
-3*d = 21 // : -3
d = 21/(-3)
d = -7
d = -7
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