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n in (-oo:+oo)
5*((1-(7*n))/5) = 0
5*((1-7*n)/5) = 0
(5*(1-7*n))/5 = 0
1-7*n = 0
1-7*n = 0 // - 1
-7*n = -1 // : -7
n = -1/(-7)
n = 1/7
n = 1/7
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