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d in (-oo:+oo)
d-(2/3) = (4/7)*d+22/21 // - (4/7)*d+22/21
d-((4/7)*d)-(2/3)-(22/21) = 0
d+(-4/7)*d-2/3-22/21 = 0
3/7*d-12/7 = 0 // + 12/7
3/7*d = 12/7 // : 3/7
d = 12/7/3/7
d = 4
d = 4
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