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