12/14=z/21

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Solution for 12/14=z/21 equation: 


z in (-oo:+oo)

12/14 = z/21 // - z/21

12/14-(z/21) = 0

6/7-1/21*z = 0 // - 6/7

-1/21*z = -6/7 // : -1/21

z = -6/7/(-1/21)

z = 18

z = 18

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