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n in (-oo:+oo)
7-(3*n) = 13-2*n // - 13-2*n
7-(3*n)-(-2*n)-13 = 0
2*n-3*n-13+7 = 0
-n-6 = 0 // + 6
-n = 6 // * -1
n = -6
n = -6
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