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d in (-oo:+oo)
3*(2-(6*d)) = -156 // + 156
3*(2-(6*d))+156 = 0
3*(2-6*d)+156 = 0
3*(2-6*d)+156 = 0
162-18*d = 0
162-18*d = 0
162-18*d = 0 // - 162
-18*d = -162 // : -18
d = -162/(-18)
d = 9
d = 9
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