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n in (-oo:+oo)
2*n-6 = 3*n-12 // - 3*n-12
2*n-(3*n)-6+12 = 0
2*n-3*n-6+12 = 0
6-n = 0 // - 6
-n = -6 // * -1
n = 6
n = 6
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