-1-4n=-21

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Solution for -1-4n=-21 equation: 


n in (-oo:+oo)

-(4*n)-1 = -21 // + 21

21-(4*n)-1 = 0

21-4*n-1 = 0

20-4*n = 0 // - 20

-4*n = -20 // : -4

n = -20/(-4)

n = 5

n = 5

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