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49=9+8b
We move all terms to the left:
49-(9+8b)=0
We add all the numbers together, and all the variables
-(8b+9)+49=0
We get rid of parentheses
-8b-9+49=0
We add all the numbers together, and all the variables
-8b+40=0
We move all terms containing b to the left, all other terms to the right
-8b=-40
b=-40/-8
b=+5
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