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n in (-oo:+oo)
9-(3*n) = 1-2*n // - 1-2*n
9-(3*n)-(-2*n)-1 = 0
2*n-3*n-1+9 = 0
8-n = 0 // - 8
-n = -8 // * -1
n = 8
n = 8
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