n/4-20=1 - solution

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Solution for n/4-20=1 equation:

n in (-oo:+oo)

n/4-20 = 1 // - 1

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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