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d in (-oo:+oo)
65/12 = 7*d+(3/4)*d+8 // - 7*d+(3/4)*d+8
65/12-(7*d)-((3/4)*d)-8 = 0
(-3/4)*d-7*d+65/12-8 = 0
-31/4*d-31/12 = 0 // + 31/12
-31/4*d = 31/12 // : -31/4
d = 31/12/(-31/4)
d = -1/3
d = -1/3
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