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d in (-oo:+oo)
(1/5)*d+8 = 229/30-((1/6)*d) // - 229/30-((1/6)*d)
(1/5)*d+(1/6)*d-(229/30)+8 = 0
(1/5)*d+(1/6)*d-229/30+8 = 0
11/30*d+11/30 = 0 // - 11/30
11/30*d = -11/30 // : 11/30
d = -11/30/11/30
d = -1
d = -1
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