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n in (-oo:+oo)
5*n+2/3+7 = 9 // - 9
5*n+2/3-9+7 = 0
5*n-4/3 = 0 // + 4/3
5*n = 4/3 // : 5
n = 4/3/5
n = 4/15
n = 4/15
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