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360=209+99+b
We move all terms to the left:
360-(209+99+b)=0
We add all the numbers together, and all the variables
-(b+308)+360=0
We get rid of parentheses
-b-308+360=0
We add all the numbers together, and all the variables
-1b+52=0
We move all terms containing b to the left, all other terms to the right
-b=-52
b=-52/-1
b=+52
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