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d in (-oo:+oo)
3*d-(6*d)-4 = -22 // + 22
3*d-(6*d)-4+22 = 0
3*d-6*d-4+22 = 0
18-3*d = 0 // - 18
-3*d = -18 // : -3
d = -18/(-3)
d = 6
d = 6
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