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d in (-oo:+oo)
92 = 7*d+d+4 // - 7*d+d+4
92-(7*d)-d-4 = 0
92-7*d-d-4 = 0
88-8*d = 0 // - 88
-8*d = -88 // : -8
d = -88/(-8)
d = 11
d = 11
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