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d in (-oo:+oo)
7*d+1/5 = 351/5-(7*d) // - 351/5-(7*d)
7*d+7*d+1/5-(351/5) = 0
7*d+7*d+1/5-351/5 = 0
14*d-70 = 0 // + 70
14*d = 70 // : 14
d = 70/14
d = 5
d = 5
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