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d in (-oo:+oo)
(-3/7)*d-(3/5) = (4/5)*d-(339/350) // - (4/5)*d-(339/350)
(-3/7)*d-((4/5)*d)-(3/5)+339/350 = 0
(-3/7)*d+(-4/5)*d-3/5+339/350 = 0
129/350-43/35*d = 0 // - 129/350
-43/35*d = -129/350 // : -43/35
d = -129/350/(-43/35)
d = 3/10
d = 3/10
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