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3(12-z)=6
We move all terms to the left:
3(12-z)-(6)=0
We add all the numbers together, and all the variables
3(-1z+12)-6=0
We multiply parentheses
-3z+36-6=0
We add all the numbers together, and all the variables
-3z+30=0
We move all terms containing z to the left, all other terms to the right
-3z=-30
z=-30/-3
z=+10
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