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7=11-b
We move all terms to the left:
7-(11-b)=0
We add all the numbers together, and all the variables
-(-1b+11)+7=0
We get rid of parentheses
1b-11+7=0
We add all the numbers together, and all the variables
b-4=0
We move all terms containing b to the left, all other terms to the right
b=4
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