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d in (-oo:+oo)
6*(6-(3*d)) = -126 // + 126
6*(6-(3*d))+126 = 0
6*(6-3*d)+126 = 0
6*(6-3*d)+126 = 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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