n/4=-21

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Solution for n/4=-21 equation: 


n in (-oo:+oo)

n/4 = -21 // + 21

n/4+21 = 0

1/4*n+21 = 0 // - 21

1/4*n = -21 // : 1/4

n = -21/1/4

n = -84

n = -84

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