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d in (-oo:+oo)
8/9-(4*d) = (4/5)*d-(28/9) // - (4/5)*d-(28/9)
8/9-(4*d)-((4/5)*d)+28/9 = 0
(-4/5)*d-4*d+8/9+28/9 = 0
4-24/5*d = 0 // - 4
-24/5*d = -4 // : -24/5
d = -4/(-24/5)
d = 5/6
d = 5/6
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