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n in (-oo:+oo)
2*n-(4*n)+3 = -11 // + 11
2*n-(4*n)+3+11 = 0
2*n-4*n+3+11 = 0
14-2*n = 0 // - 14
-2*n = -14 // : -2
n = -14/(-2)
n = 7
n = 7
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