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d in (-oo:+oo)
(1/5)*d+4*d+1/6 = 1139/30 // - 1139/30
(1/5)*d+4*d+1/6-(1139/30) = 0
(1/5)*d+4*d+1/6-1139/30 = 0
21/5*d-189/5 = 0 // + 189/5
21/5*d = 189/5 // : 21/5
d = 189/5/21/5
d = 9
d = 9
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