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n in (-oo:+oo)
n/3-(5*n) = 1/3 // - 1/3
n/3-(5*n)-(1/3) = 0
n/3-5*n-1/3 = 0
-14/3*n-1/3 = 0 // + 1/3
-14/3*n = 1/3 // : -14/3
n = 1/3/(-14/3)
n = -1/14
n = -1/14
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