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n in (-oo:+oo)
6-(6*n) = 3*n-39 // - 3*n-39
6-(6*n)-(3*n)+39 = 0
6-6*n-3*n+39 = 0
45-9*n = 0 // - 45
-9*n = -45 // : -9
n = -45/(-9)
n = 5
n = 5
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