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n in (-oo:+oo)
7*(1-(2*n)) = 7 // - 7
7*(1-(2*n))-7 = 0
7*(1-2*n)-7 = 0
7*(1-2*n)-7 = 0
-14*n = 0
-14*n = 0
-14*n = 0 // : -14
n = 0
n = 0
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