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d in (-oo:+oo)
(3/8)*d-(1/4) = 1/5 // - 1/5
(3/8)*d-(1/4)-(1/5) = 0
(3/8)*d-1/4-1/5 = 0
3/8*d-9/20 = 0 // + 9/20
3/8*d = 9/20 // : 3/8
d = 9/20/3/8
d = 6/5
d = 6/5
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