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-2(z-12)=-6
We move all terms to the left:
-2(z-12)-(-6)=0
We add all the numbers together, and all the variables
-2(z-12)+6=0
We multiply parentheses
-2z+24+6=0
We add all the numbers together, and all the variables
-2z+30=0
We move all terms containing z to the left, all other terms to the right
-2z=-30
z=-30/-2
z=+15
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