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d in (-oo:+oo)
4*d+5/9 = 257/9 // - 257/9
4*d+5/9-(257/9) = 0
4*d+5/9-257/9 = 0
4*d-28 = 0 // + 28
4*d = 28 // : 4
d = 28/4
d = 7
d = 7
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