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13=2z+3
We move all terms to the left:
13-(2z+3)=0
We get rid of parentheses
-2z-3+13=0
We add all the numbers together, and all the variables
-2z+10=0
We move all terms containing z to the left, all other terms to the right
-2z=-10
z=-10/-2
z=+5
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