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2z+9z=4z-45+2z
We move all terms to the left:
2z+9z-(4z-45+2z)=0
We add all the numbers together, and all the variables
2z+9z-(6z-45)=0
We add all the numbers together, and all the variables
11z-(6z-45)=0
We get rid of parentheses
11z-6z+45=0
We add all the numbers together, and all the variables
5z+45=0
We move all terms containing z to the left, all other terms to the right
5z=-45
z=-45/5
z=-9
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