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n in (-oo:+oo)
(25/5)*n-(2/3) = -1 // + 1
(25/5)*n-(2/3)+1 = 0
(25/5)*n-2/3+1 = 0
5*n+1/3 = 0 // - 1/3
5*n = -1/3 // : 5
n = -1/3/5
n = -1/15
n = -1/15
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