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d in (-oo:+oo)
7*d-1/9 = (1/3)*d+109/99 // - (1/3)*d+109/99
7*d-((1/3)*d)-1/9-(109/99) = 0
7*d+(-1/3)*d-1/9-109/99 = 0
20/3*d-40/33 = 0 // + 40/33
20/3*d = 40/33 // : 20/3
d = 40/33/20/3
d = 2/11
d = 2/11
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