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13=z/3
We move all terms to the left:
13-(z/3)=0
We add all the numbers together, and all the variables
-(+z/3)+13=0
We get rid of parentheses
-z/3+13=0
We multiply all the terms by the denominator
-z+13*3=0
We add all the numbers together, and all the variables
-1z+39=0
We move all terms containing z to the left, all other terms to the right
-z=-39
z=-39/-1
z=+39
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