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n in (-oo:+oo)
-(2*n)-4/5 = -10/5 // + -10/5
-(2*n)-4/5-(-10/5) = 0
2-2*n-4/5 = 0
6/5-2*n = 0 // - 6/5
-2*n = -6/5 // : -2
n = -6/5/(-2)
n = 3/5
n = 3/5
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