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n in (-oo:+oo)
6*(1-(2*n)) = -126 // + 126
6*(1-(2*n))+126 = 0
6*(1-2*n)+126 = 0
6*(1-2*n)+126 = 0
132-12*n = 0
132-12*n = 0
132-12*n = 0 // - 132
-12*n = -132 // : -12
n = -132/(-12)
n = 11
n = 11
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