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d in (-oo:+oo)
-7*d-((5/6)*d)-8 = -167/15 // + -167/15
-7*d-((5/6)*d)-(-167/15)-8 = 0
(-5/6)*d-7*d+167/15-8 = 0
47/15-47/6*d = 0 // - 47/15
-47/6*d = -47/15 // : -47/6
d = -47/15/(-47/6)
d = 2/5
d = 2/5
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