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7+13z=8z+2
We move all terms to the left:
7+13z-(8z+2)=0
We get rid of parentheses
13z-8z-2+7=0
We add all the numbers together, and all the variables
5z+5=0
We move all terms containing z to the left, all other terms to the right
5z=-5
z=-5/5
z=-1
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