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n in (-oo:+oo)
3*(6*n-3) = 117 // - 117
3*(6*n-3)-117 = 0
3*(6*n-3)-117 = 0
18*n-126 = 0
18*n-126 = 0
18*n-126 = 0 // + 126
18*n = 126 // : 18
n = 126/18
n = 7
n = 7
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