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d in (-oo:+oo)
241/40 = (4/5)*d+d+5/8 // - (4/5)*d+d+5/8
241/40-((4/5)*d)-d-(5/8) = 0
(-4/5)*d-d+241/40-5/8 = 0
27/5-9/5*d = 0 // - 27/5
-9/5*d = -27/5 // : -9/5
d = -27/5/(-9/5)
d = 3
d = 3
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