-21=-7n+n-3 - solution

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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-21+3 = 0

6*n-18 = 0 // + 18

6*n = 18 // : 6

n = 18/6

n = 3

n = 3

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