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d in (-oo:+oo)
(3/4)*d+6*d+3/5 = 69/40 // - 69/40
(3/4)*d+6*d+3/5-(69/40) = 0
(3/4)*d+6*d+3/5-69/40 = 0
27/4*d-9/8 = 0 // + 9/8
27/4*d = 9/8 // : 27/4
d = 9/8/27/4
d = 1/6
d = 1/6
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