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d in (-oo:+oo)
3-6*d = 5*d-96 // - 5*d-96
3-6*d-(5*d)+96 = 0
3-6*d-5*d+96 = 0
99-11*d = 0 // - 99
-11*d = -99 // : -11
d = -99/(-11)
d = 9
d = 9
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