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d in (-oo:+oo)
(2/3)*d+9 = (3/4)*d+487/54 // - (3/4)*d+487/54
(2/3)*d-((3/4)*d)-(487/54)+9 = 0
(2/3)*d+(-3/4)*d-487/54+9 = 0
-1/12*d-1/54 = 0 // + 1/54
-1/12*d = 1/54 // : -1/12
d = 1/54/(-1/12)
d = -2/9
d = -2/9
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