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12=13z-4z+6
We move all terms to the left:
12-(13z-4z+6)=0
We add all the numbers together, and all the variables
-(9z+6)+12=0
We get rid of parentheses
-9z-6+12=0
We add all the numbers together, and all the variables
-9z+6=0
We move all terms containing z to the left, all other terms to the right
-9z=-6
z=-6/-9
z=2/3
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