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10=13-b
We move all terms to the left:
10-(13-b)=0
We add all the numbers together, and all the variables
-(-1b+13)+10=0
We get rid of parentheses
1b-13+10=0
We add all the numbers together, and all the variables
b-3=0
We move all terms containing b to the left, all other terms to the right
b=3
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