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d in (-oo:+oo)
(2/5)*d = 284/5 // - 284/5
(2/5)*d-(284/5) = 0
(2/5)*d-284/5 = 0
2/5*d-284/5 = 0 // + 284/5
2/5*d = 284/5 // : 2/5
d = 284/5/2/5
d = 142
d = 142
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