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d in (-oo:+oo)
4*d-(4/5) = 3 // - 3
4*d-(4/5)-3 = 0
4*d-4/5-3 = 0
4*d-19/5 = 0 // + 19/5
4*d = 19/5 // : 4
d = 19/5/4
d = 19/20
d = 19/20
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