21=-7n+n-3

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Solution for 21=-7n+n-3 equation: 


n in (-oo:+oo)

21 = n-7*n-3 // - n-7*n-3

3-(-7*n)-n+21 = 0

7*n-n+3+21 = 0

6*n+24 = 0 // - 24

6*n = -24 // : 6

n = -24/6

n = -4

n = -4

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