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d in (-oo:+oo)
-9/14 = 5*d-((2/7)*d)-3 // - 5*d-((2/7)*d)-3
(2/7)*d-(5*d)-9/14+3 = 0
(2/7)*d-5*d-9/14+3 = 0
33/14-33/7*d = 0 // - 33/14
-33/7*d = -33/14 // : -33/7
d = -33/14/(-33/7)
d = 1/2
d = 1/2
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