7+12z-4=9z+21-6z

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Solution for 7+12z-4=9z+21-6z equation: 



7+12z-4=9z+21-6z

We move all terms to the left:

7+12z-4-(9z+21-6z)=0

We add all the numbers together, and all the variables

12z-(3z+21)+7-4=0

We add all the numbers together, and all the variables

12z-(3z+21)+3=0

We get rid of parentheses

12z-3z-21+3=0

We add all the numbers together, and all the variables

9z-18=0

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

9z=18

z=18/9

z=2

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