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d in (-oo:+oo)
(4/5)*d-(7*d)-4/5 = 10/3 // - 10/3
(4/5)*d-(7*d)-4/5-(10/3) = 0
(4/5)*d-7*d-4/5-10/3 = 0
-31/5*d-62/15 = 0 // + 62/15
-31/5*d = 62/15 // : -31/5
d = 62/15/(-31/5)
d = -2/3
d = -2/3
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