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-2z-13=-15z+13
We move all terms to the left:
-2z-13-(-15z+13)=0
We get rid of parentheses
-2z+15z-13-13=0
We add all the numbers together, and all the variables
13z-26=0
We move all terms containing z to the left, all other terms to the right
13z=26
z=26/13
z=2
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