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d in (-oo:+oo)
(2/3)*d-(2/5) = 64/15 // - 64/15
(2/3)*d-(2/5)-(64/15) = 0
(2/3)*d-2/5-64/15 = 0
2/3*d-14/3 = 0 // + 14/3
2/3*d = 14/3 // : 2/3
d = 14/3/2/3
d = 7
d = 7
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