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n in (-oo:+oo)
6 = 3*n-2*n+2 // - 3*n-2*n+2
6-(-2*n)-(3*n)-2 = 0
2*n-3*n-2+6 = 0
4-n = 0 // - 4
-n = -4 // * -1
n = 4
n = 4
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