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12=-6+3z
We move all terms to the left:
12-(-6+3z)=0
We add all the numbers together, and all the variables
-(3z-6)+12=0
We get rid of parentheses
-3z+6+12=0
We add all the numbers together, and all the variables
-3z+18=0
We move all terms containing z to the left, all other terms to the right
-3z=-18
z=-18/-3
z=+6
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