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13=5z+8
We move all terms to the left:
13-(5z+8)=0
We get rid of parentheses
-5z-8+13=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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