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d in (-oo:+oo)
73 = d+6*d+10 // - d+6*d+10
73-d-(6*d)-10 = 0
73-d-6*d-10 = 0
63-7*d = 0 // - 63
-7*d = -63 // : -7
d = -63/(-7)
d = 9
d = 9
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