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6(4z+2)-20z=40
We move all terms to the left:
6(4z+2)-20z-(40)=0
We add all the numbers together, and all the variables
-20z+6(4z+2)-40=0
We multiply parentheses
-20z+24z+12-40=0
We add all the numbers together, and all the variables
4z-28=0
We move all terms containing z to the left, all other terms to the right
4z=28
z=28/4
z=7
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