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n in (-oo:+oo)
6*n+9 = 2*n+41 // - 2*n+41
6*n-(2*n)-41+9 = 0
6*n-2*n-41+9 = 0
4*n-32 = 0 // + 32
4*n = 32 // : 4
n = 32/4
n = 8
n = 8
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