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d in (-oo:+oo)
(4/5)*d = 2/7 // - 2/7
(4/5)*d-(2/7) = 0
(4/5)*d-2/7 = 0
4/5*d-2/7 = 0 // + 2/7
4/5*d = 2/7 // : 4/5
d = 2/7/4/5
d = 5/14
d = 5/14
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