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d in (-oo:+oo)
66 = d+6*d+3 // - d+6*d+3
66-d-(6*d)-3 = 0
66-d-6*d-3 = 0
63-7*d = 0 // - 63
-7*d = -63 // : -7
d = -63/(-7)
d = 9
d = 9
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