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n in (-oo:+oo)
(1/7)*n-(4*n) = (1/3)*n // - (1/3)*n
(1/7)*n-(4*n)-((1/3)*n) = 0
(1/7)*n-4*n+(-1/3)*n = 0
-88/21*n = 0 // : -88/21
n = 0
n = 0
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