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149=9+10b
We move all terms to the left:
149-(9+10b)=0
We add all the numbers together, and all the variables
-(10b+9)+149=0
We get rid of parentheses
-10b-9+149=0
We add all the numbers together, and all the variables
-10b+140=0
We move all terms containing b to the left, all other terms to the right
-10b=-140
b=-140/-10
b=+14
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