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8=12-2z
We move all terms to the left:
8-(12-2z)=0
We add all the numbers together, and all the variables
-(-2z+12)+8=0
We get rid of parentheses
2z-12+8=0
We add all the numbers together, and all the variables
2z-4=0
We move all terms containing z to the left, all other terms to the right
2z=4
z=4/2
z=2
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