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13=z/5+9
We move all terms to the left:
13-(z/5+9)=0
We get rid of parentheses
-z/5-9+13=0
We multiply all the terms by the denominator
-z-9*5+13*5=0
We add all the numbers together, and all the variables
-1z+20=0
We move all terms containing z to the left, all other terms to the right
-z=-20
z=-20/-1
z=+20
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