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n in (-oo:+oo)
3*(6*n+9) = 63 // - 63
3*(6*n+9)-63 = 0
3*(6*n+9)-63 = 0
18*n-36 = 0
18*n-36 = 0
18*n-36 = 0 // + 36
18*n = 36 // : 18
n = 36/18
n = 2
n = 2
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