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d in (-oo:+oo)
7*d-(7/8) = -147/40 // + -147/40
7*d-(7/8)-(-147/40) = 0
7*d-7/8+147/40 = 0
7*d+14/5 = 0 // - 14/5
7*d = -14/5 // : 7
d = -14/5/7
d = -2/5
d = -2/5
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