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n in (-oo:+oo)
6*(2-6*n) = 336 // - 336
6*(2-6*n)-336 = 0
6*(2-6*n)-336 = 0
-36*n-324 = 0
-36*n-324 = 0
-36*n-324 = 0 // + 324
-36*n = 324 // : -36
n = 324/(-36)
n = -9
n = -9
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