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d in (-oo:+oo)
(7/9)*d-7 = 5/9-3 // - 5/9-3
(7/9)*d-(5/9)-7+3 = 0
(7/9)*d-5/9-7+3 = 0
7/9*d-41/9 = 0 // + 41/9
7/9*d = 41/9 // : 7/9
d = 41/9/7/9
d = 41/7
d = 41/7
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