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n in (-oo:+oo)
2*(1*n+6) = 18 // - 18
2*(1*n+6)-18 = 0
2*(n+6)-18 = 0
2*(n+6)-18 = 0
2*n-6 = 0
2*n-6 = 0
2*n-6 = 0 // + 6
2*n = 6 // : 2
n = 6/2
n = 3
n = 3
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