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-4z=-12-6z
We move all terms to the left:
-4z-(-12-6z)=0
We add all the numbers together, and all the variables
-4z-(-6z-12)=0
We get rid of parentheses
-4z+6z+12=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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