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500+b=200.b=
We move all terms to the left:
500+b-(200.b)=0
We add all the numbers together, and all the variables
b-(+200.b)+500=0
We get rid of parentheses
b-200.b+500=0
We add all the numbers together, and all the variables
-199b+500=0
We move all terms containing b to the left, all other terms to the right
-199b=-500
b=-500/-199
b=2+102/199
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