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d in (-oo:+oo)
(5/9)*d = 9/4 // - 9/4
(5/9)*d-(9/4) = 0
(5/9)*d-9/4 = 0
5/9*d-9/4 = 0 // + 9/4
5/9*d = 9/4 // : 5/9
d = 9/4/5/9
d = 81/20
d = 81/20
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