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n in (-oo:+oo)
6*(3*n+9) = 234 // - 234
6*(3*n+9)-234 = 0
6*(3*n+9)-234 = 0
18*n-180 = 0
18*n-180 = 0
18*n-180 = 0 // + 180
18*n = 180 // : 18
n = 180/18
n = 10
n = 10
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