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2=12z+2z
We move all terms to the left:
2-(12z+2z)=0
We add all the numbers together, and all the variables
-(+14z)+2=0
We get rid of parentheses
-14z+2=0
We move all terms containing z to the left, all other terms to the right
-14z=-2
z=-2/-14
z=1/7
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