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n in (-oo:+oo)
-3 = 3*n-2*n-7 // - 3*n-2*n-7
7-(-2*n)-(3*n)-3 = 0
2*n-3*n-3+7 = 0
4-n = 0 // - 4
-n = -4 // * -1
n = 4
n = 4
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