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d in (-oo:+oo)
d+3/10 = (2/7)*d-(53/490) // - (2/7)*d-(53/490)
d-((2/7)*d)+3/10+53/490 = 0
d+(-2/7)*d+3/10+53/490 = 0
5/7*d+20/49 = 0 // - 20/49
5/7*d = -20/49 // : 5/7
d = -20/49/5/7
d = -4/7
d = -4/7
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