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d in (-oo:+oo)
3*d-2 = 4*d-14 // - 4*d-14
3*d-(4*d)-2+14 = 0
3*d-4*d-2+14 = 0
12-d = 0 // - 12
-d = -12 // * -1
d = 12
d = 12
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