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-6-z=-6-3z-6
We move all terms to the left:
-6-z-(-6-3z-6)=0
We add all the numbers together, and all the variables
-z-(-3z-12)-6=0
We add all the numbers together, and all the variables
-1z-(-3z-12)-6=0
We get rid of parentheses
-1z+3z+12-6=0
We add all the numbers together, and all the variables
2z+6=0
We move all terms containing z to the left, all other terms to the right
2z=-6
z=-6/2
z=-3
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