4n+1=21

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Solution for 4n+1=21 equation: 


n in (-oo:+oo)

4*n+1 = 21 // - 21

4*n-21+1 = 0

4*n-20 = 0 // + 20

4*n = 20 // : 4

n = 20/4

n = 5

n = 5

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