n/21=-4 - solution

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Solution for n/21=-4 equation:

n in (-oo:+oo)

n/21 = -4 // + 4

n/21+4 = 0

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

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

n = -4/1/21

n = -84

n = -84

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