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d in (-oo:+oo)
5/9 = d/4.5 // - d/4.5
5/9-(d/4.5) = 0
5/9-0.22222222*d = 0
5/9-0.22222222*d = 0 // - 5/9
-0.22222222*d = -5/9 // : -0.22222222
d = -5/9/(-0.22222222)
d = 2.50000005
d = 2.50000005
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