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d in (-oo:+oo)
5/8-(7*d) = -199/40 // + -199/40
5/8-(7*d)-(-199/40) = 0
5/8-7*d+199/40 = 0
28/5-7*d = 0 // - 28/5
-7*d = -28/5 // : -7
d = -28/5/(-7)
d = 4/5
d = 4/5
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