4/7=n/21 - solution

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Solution for 4/7=n/21 equation:

n in (-oo:+oo)

4/7 = n/21 // - n/21

4/7-(n/21) = 0

4/7-1/21*n = 0 // - 4/7

-1/21*n = -4/7 // : -1/21

n = -4/7/(-1/21)

n = 12

n = 12

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