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d in (-oo:+oo)
-16/315 = (4/7)*d-d-(2/9) // - (4/7)*d-d-(2/9)
d-((4/7)*d)-16/315+2/9 = 0
d+(-4/7)*d-16/315+2/9 = 0
3/7*d+6/35 = 0 // - 6/35
3/7*d = -6/35 // : 3/7
d = -6/35/3/7
d = -2/5
d = -2/5
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