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10=31-3z
We move all terms to the left:
10-(31-3z)=0
We add all the numbers together, and all the variables
-(-3z+31)+10=0
We get rid of parentheses
3z-31+10=0
We add all the numbers together, and all the variables
3z-21=0
We move all terms containing z to the left, all other terms to the right
3z=21
z=21/3
z=7
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