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-12=13+5z
We move all terms to the left:
-12-(13+5z)=0
We add all the numbers together, and all the variables
-(5z+13)-12=0
We get rid of parentheses
-5z-13-12=0
We add all the numbers together, and all the variables
-5z-25=0
We move all terms containing z to the left, all other terms to the right
-5z=25
z=25/-5
z=-5
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