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d in (-oo:+oo)
(7/27)*d = 5/9 // - 5/9
(7/27)*d-(5/9) = 0
(7/27)*d-5/9 = 0
7/27*d-5/9 = 0 // + 5/9
7/27*d = 5/9 // : 7/27
d = 5/9/7/27
d = 15/7
d = 15/7
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