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n in (-oo:+oo)
(n+5)/5 = 7 // - 7
(n+5)/5-7 = 0
(n+5)/5+(-7*5)/5 = 0
n-7*5+5 = 0
n-30 = 0
(n-30)/5 = 0
(n-30)/5 = 0 // * 5
n-30 = 0
n-30 = 0 // + 30
n = 30
n = 30
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