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9200=200*100+b
We move all terms to the left:
9200-(200*100+b)=0
We add all the numbers together, and all the variables
-(b+20000)+9200=0
We get rid of parentheses
-b-20000+9200=0
We add all the numbers together, and all the variables
-1b-10800=0
We move all terms containing b to the left, all other terms to the right
-b=10800
b=10800/-1
b=-10800
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