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800=700+b
We move all terms to the left:
800-(700+b)=0
We add all the numbers together, and all the variables
-(b+700)+800=0
We get rid of parentheses
-b-700+800=0
We add all the numbers together, and all the variables
-1b+100=0
We move all terms containing b to the left, all other terms to the right
-b=-100
b=-100/-1
b=+100
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