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d in (-oo:+oo)
(5/9)*d = 31/4 // - 31/4
(5/9)*d-(31/4) = 0
(5/9)*d-31/4 = 0
5/9*d-31/4 = 0 // + 31/4
5/9*d = 31/4 // : 5/9
d = 31/4/5/9
d = 279/20
d = 279/20
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