4/21=4/7n

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Solution for 4/21=4/7n equation: 


n in (-oo:+oo)

4/21 = (4/7)*n // - (4/7)*n

4/21-((4/7)*n) = 0

(-4/7)*n+4/21 = 0

4/21-4/7*n = 0 // - 4/21

-4/7*n = -4/21 // : -4/7

n = -4/21/(-4/7)

n = 1/3

n = 1/3

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