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n in (-oo:+oo)
3*n+7 = 64/7 // - 64/7
3*n-(64/7)+7 = 0
3*n-64/7+7 = 0
3*n-15/7 = 0 // + 15/7
3*n = 15/7 // : 3
n = 15/7/3
n = 5/7
n = 5/7
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