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d in (-oo:+oo)
5*(6-(6*d)) = 120 // - 120
5*(6-(6*d))-120 = 0
5*(6-6*d)-120 = 0
5*(6-6*d)-120 = 0
-30*d-90 = 0
-30*d-90 = 0
-30*d-90 = 0 // + 90
-30*d = 90 // : -30
d = 90/(-30)
d = -3
d = -3
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