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d in (-oo:+oo)
7*d+1/5 = 421/5 // - 421/5
7*d+1/5-(421/5) = 0
7*d+1/5-421/5 = 0
7*d-84 = 0 // + 84
7*d = 84 // : 7
d = 84/7
d = 12
d = 12
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