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n in (-oo:+oo)
3*(6*n+9) = 225 // - 225
3*(6*n+9)-225 = 0
3*(6*n+9)-225 = 0
18*n-198 = 0
18*n-198 = 0
18*n-198 = 0 // + 198
18*n = 198 // : 18
n = 198/18
n = 11
n = 11
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