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2=20-6z
We move all terms to the left:
2-(20-6z)=0
We add all the numbers together, and all the variables
-(-6z+20)+2=0
We get rid of parentheses
6z-20+2=0
We add all the numbers together, and all the variables
6z-18=0
We move all terms containing z to the left, all other terms to the right
6z=18
z=18/6
z=3
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