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