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8z-7=3z-7+5z+2z
We move all terms to the left:
8z-7-(3z-7+5z+2z)=0
We add all the numbers together, and all the variables
8z-(10z-7)-7=0
We get rid of parentheses
8z-10z+7-7=0
We add all the numbers together, and all the variables
-2z=0
z=0/-2
z=0
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