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n in (-oo:+oo)
7/3 = 9-4*n-(6*n) // - 9-4*n-(6*n)
6*n-(-4*n)+7/3-9 = 0
4*n+6*n+7/3-9 = 0
10*n-20/3 = 0 // + 20/3
10*n = 20/3 // : 10
n = 20/3/10
n = 2/3
n = 2/3
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