-n-3=n+21

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Solution for -n-3=n+21 equation: 


n in (-oo:+oo)

-n-3 = n+21 // - n+21

-n-n-21-3 = 0

-2*n-24 = 0 // + 24

-2*n = 24 // : -2

n = 24/(-2)

n = -12

n = -12

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