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d in (-oo:+oo)
3*d-7 = 6*d-19 // - 6*d-19
3*d-(6*d)-7+19 = 0
3*d-6*d-7+19 = 0
12-3*d = 0 // - 12
-3*d = -12 // : -3
d = -12/(-3)
d = 4
d = 4
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