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13=4z+9
We move all terms to the left:
13-(4z+9)=0
We get rid of parentheses
-4z-9+13=0
We add all the numbers together, and all the variables
-4z+4=0
We move all terms containing z to the left, all other terms to the right
-4z=-4
z=-4/-4
z=1
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