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169=9+10b
We move all terms to the left:
169-(9+10b)=0
We add all the numbers together, and all the variables
-(10b+9)+169=0
We get rid of parentheses
-10b-9+169=0
We add all the numbers together, and all the variables
-10b+160=0
We move all terms containing b to the left, all other terms to the right
-10b=-160
b=-160/-10
b=+16
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