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d in (-oo:+oo)
(2/5)*d-(1/2) = 27/10 // - 27/10
(2/5)*d-(1/2)-(27/10) = 0
(2/5)*d-1/2-27/10 = 0
2/5*d-16/5 = 0 // + 16/5
2/5*d = 16/5 // : 2/5
d = 16/5/2/5
d = 8
d = 8
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