12/21=n/7

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Solution for 12/21=n/7 equation: 


n in (-oo:+oo)

12/21 = n/7 // - n/7

12/21-(n/7) = 0

4/7-1/7*n = 0 // - 4/7

-1/7*n = -4/7 // : -1/7

n = -4/7/(-1/7)

n = 4

n = 4

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