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-7+11z=13z+13
We move all terms to the left:
-7+11z-(13z+13)=0
We get rid of parentheses
11z-13z-13-7=0
We add all the numbers together, and all the variables
-2z-20=0
We move all terms containing z to the left, all other terms to the right
-2z=20
z=20/-2
z=-10
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