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n in (-oo:+oo)
5*n-(3*n)+6 = 20 // - 20
5*n-(3*n)-20+6 = 0
5*n-3*n-20+6 = 0
2*n-14 = 0 // + 14
2*n = 14 // : 2
n = 14/2
n = 7
n = 7
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