n/7=n/3+12/21

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Solution for n/7=n/3+12/21 equation: 


n in (-oo:+oo)

n/7 = n/3+12/21 // - n/3+12/21

n/7-(n/3)-(12/21) = 0

n/7-(n/3)-4/7 = 0

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

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

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

n = -3

n = -3

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