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9z+2z=50+4+2z
We move all terms to the left:
9z+2z-(50+4+2z)=0
We add all the numbers together, and all the variables
9z+2z-(2z+54)=0
We add all the numbers together, and all the variables
11z-(2z+54)=0
We get rid of parentheses
11z-2z-54=0
We add all the numbers together, and all the variables
9z-54=0
We move all terms containing z to the left, all other terms to the right
9z=54
z=54/9
z=6
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