-1=20-n/4

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Solution for -1=20-n/4 equation: 


n in (-oo:+oo)

-1 = 20-(n/4) // - 20-(n/4)

n/4-20-1 = 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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