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d in (-oo:+oo)
4*d-(6*d)+6 = -18 // + 18
4*d-(6*d)+6+18 = 0
4*d-6*d+6+18 = 0
24-2*d = 0 // - 24
-2*d = -24 // : -2
d = -24/(-2)
d = 12
d = 12
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