n/21=-3

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Solution for n/21=-3 equation: 


n in (-oo:+oo)

n/21 = -3 // + 3

n/21+3 = 0

1/21*n+3 = 0 // - 3

1/21*n = -3 // : 1/21

n = -3/1/21

n = -63

n = -63

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