-3n=-21

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Solution for -3n=-21 equation: 


n in (-oo:+oo)

-3*n = -21 // + 21

21-3*n = 0

21-3*n = 0 // - 21

-3*n = -21 // : -3

n = -21/(-3)

n = 7

n = 7

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