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d in (-oo:+oo)
3*(9-3*d) = -36 // + 36
3*(9-3*d)+36 = 0
3*(9-3*d)+36 = 0
63-9*d = 0
63-9*d = 0
63-9*d = 0 // - 63
-9*d = -63 // : -9
d = -63/(-9)
d = 7
d = 7
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