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10=20-2z
We move all terms to the left:
10-(20-2z)=0
We add all the numbers together, and all the variables
-(-2z+20)+10=0
We get rid of parentheses
2z-20+10=0
We add all the numbers together, and all the variables
2z-10=0
We move all terms containing z to the left, all other terms to the right
2z=10
z=10/2
z=5
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