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d in (-oo:+oo)
3*d-6 = 7*d+22 // - 7*d+22
3*d-(7*d)-22-6 = 0
3*d-7*d-22-6 = 0
-4*d-28 = 0 // + 28
-4*d = 28 // : -4
d = 28/(-4)
d = -7
d = -7
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