6+7z-5=9z+21-7z

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Solution for 6+7z-5=9z+21-7z equation: 



6+7z-5=9z+21-7z

We move all terms to the left:

6+7z-5-(9z+21-7z)=0

We add all the numbers together, and all the variables

7z-(2z+21)+6-5=0

We add all the numbers together, and all the variables

7z-(2z+21)+1=0

We get rid of parentheses

7z-2z-21+1=0

We add all the numbers together, and all the variables

5z-20=0

We move all terms containing z to the left, all other terms to the right

5z=20

z=20/5

z=4

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