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6n+3 = 4n-11
6n-4n = -11-3
2n = -14
n = -7
6n + 3 - 3 = 4n - 11 -3
6n = 4n - 14
6n - 4n = 4n - 4n - 14
2n = -14
n = -14 : 2
n = -7