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d in (-oo:+oo)
(-5/6)*d+6*d+3/5 = 629/15 // - 629/15
(-5/6)*d+6*d+3/5-(629/15) = 0
(-5/6)*d+6*d+3/5-629/15 = 0
31/6*d-124/3 = 0 // + 124/3
31/6*d = 124/3 // : 31/6
d = 124/3/31/6
d = 8
d = 8
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