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d in (-oo:+oo)
-2*d-7 = 7*d-79 // - 7*d-79
79-2*d-(7*d)-7 = 0
79-2*d-7*d-7 = 0
72-9*d = 0 // - 72
-9*d = -72 // : -9
d = -72/(-9)
d = 8
d = 8
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