n/3-21

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Solution for n/3-21 equation: 


n in (-oo:+oo)

n/3 < -21 // + 21

n/3+21 < 0

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

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

n < -21/1/3

n < -63

n in (-oo:-63)

(-oo:-63)

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