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3=2z+13
We move all terms to the left:
3-(2z+13)=0
We get rid of parentheses
-2z-13+3=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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