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13=1+3z
We move all terms to the left:
13-(1+3z)=0
We add all the numbers together, and all the variables
-(3z+1)+13=0
We get rid of parentheses
-3z-1+13=0
We add all the numbers together, and all the variables
-3z+12=0
We move all terms containing z to the left, all other terms to the right
-3z=-12
z=-12/-3
z=+4
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