7z-21/3-z

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Solution for 7z-21/3-z equation: 


z in (-oo:+oo)

7*z-z-(21/3) = 0

7*z-z-7 = 0

6*z-7 = 0 // + 7

6*z = 7 // : 6

z = 7/6

z = 7/6

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