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n in (-oo:+oo)
(n+2)/10 = 70 // - 70
(n+2)/10-70 = 0
(n+2)/10+(-70*10)/10 = 0
n-70*10+2 = 0
n-698 = 0
(n-698)/10 = 0
(n-698)/10 = 0 // * 10
n-698 = 0
n-698 = 0 // + 698
n = 698
n = 698
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