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d in (-oo:+oo)
(4/5)*d+3/4 = 159/20 // - 159/20
(4/5)*d+3/4-(159/20) = 0
(4/5)*d+3/4-159/20 = 0
4/5*d-36/5 = 0 // + 36/5
4/5*d = 36/5 // : 4/5
d = 36/5/4/5
d = 9
d = 9
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