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d in (-oo:+oo)
(4/7)*d+2/5 = 54/35 // - 54/35
(4/7)*d+2/5-(54/35) = 0
(4/7)*d+2/5-54/35 = 0
4/7*d-8/7 = 0 // + 8/7
4/7*d = 8/7 // : 4/7
d = 8/7/4/7
d = 2
d = 2
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