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d in (-oo:+oo)
7/8-(4*d) = -89/8 // + -89/8
7/8-(4*d)-(-89/8) = 0
7/8-4*d+89/8 = 0
12-4*d = 0 // - 12
-4*d = -12 // : -4
d = -12/(-4)
d = 3
d = 3
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