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n in (-oo:+oo)
6*n-6 = 30-6*n // - 30-6*n
6*n-(-6*n)-30-6 = 0
6*n+6*n-30-6 = 0
12*n-36 = 0 // + 36
12*n = 36 // : 12
n = 36/12
n = 3
n = 3
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