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d in (-oo:+oo)
(2/5)*d = 3/10 // - 3/10
(2/5)*d-(3/10) = 0
(2/5)*d-3/10 = 0
2/5*d-3/10 = 0 // + 3/10
2/5*d = 3/10 // : 2/5
d = 3/10/2/5
d = 3/4
d = 3/4
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