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