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13=8+z/6
We move all terms to the left:
13-(8+z/6)=0
We add all the numbers together, and all the variables
-(z/6+8)+13=0
We get rid of parentheses
-z/6-8+13=0
We multiply all the terms by the denominator
-z-8*6+13*6=0
We add all the numbers together, and all the variables
-1z+30=0
We move all terms containing z to the left, all other terms to the right
-z=-30
z=-30/-1
z=+30
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