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n in (-oo:+oo)
n/5-(2/5) = 4*n+1 // - 4*n+1
n/5-(4*n)-(2/5)-1 = 0
n/5-4*n-2/5-1 = 0
-19/5*n-7/5 = 0 // + 7/5
-19/5*n = 7/5 // : -19/5
n = 7/5/(-19/5)
n = -7/19
n = -7/19
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