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d in (-oo:+oo)
(1/5)*d+19/20 = ((4/57)/20)*d // - ((4/57)/20)*d
(1/5)*d-(((4/57)/20)*d)+19/20 = 0
(1/5)*d+(-1/285)*d+19/20 = 0
56/285*d+19/20 = 0 // - 19/20
56/285*d = -19/20 // : 56/285
d = -19/20/56/285
d = -1083/224
d = -1083/224
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