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d in (-oo:+oo)
1/9-3*d = 3*d-215/9 // - 3*d-215/9
1/9-3*d-(3*d)-(-215/9) = 0
1/9-3*d-3*d+215/9 = 0
24-6*d = 0 // - 24
-6*d = -24 // : -6
d = -24/(-6)
d = 4
d = 4
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