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-12z+30=-6z-6
We move all terms to the left:
-12z+30-(-6z-6)=0
We get rid of parentheses
-12z+6z+6+30=0
We add all the numbers together, and all the variables
-6z+36=0
We move all terms containing z to the left, all other terms to the right
-6z=-36
z=-36/-6
z=+6
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