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d in (-oo:+oo)
3*(2-4*d) = -18 // + 18
3*(2-4*d)+18 = 0
3*(2-4*d)+18 = 0
24-12*d = 0
24-12*d = 0
24-12*d = 0 // - 24
-12*d = -24 // : -12
d = -24/(-12)
d = 2
d = 2
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