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2z+z+2+3z+z+2=7+z
We move all terms to the left:
2z+z+2+3z+z+2-(7+z)=0
We add all the numbers together, and all the variables
2z+z+3z+z-(z+7)+2+2=0
We add all the numbers together, and all the variables
7z-(z+7)+4=0
We get rid of parentheses
7z-z-7+4=0
We add all the numbers together, and all the variables
6z-3=0
We move all terms containing z to the left, all other terms to the right
6z=3
z=3/6
z=1/2
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