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9+10z=-3+12z
We move all terms to the left:
9+10z-(-3+12z)=0
We add all the numbers together, and all the variables
10z-(12z-3)+9=0
We get rid of parentheses
10z-12z+3+9=0
We add all the numbers together, and all the variables
-2z+12=0
We move all terms containing z to the left, all other terms to the right
-2z=-12
z=-12/-2
z=+6
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