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26=12+b+9
We move all terms to the left:
26-(12+b+9)=0
We add all the numbers together, and all the variables
-(b+21)+26=0
We get rid of parentheses
-b-21+26=0
We add all the numbers together, and all the variables
-1b+5=0
We move all terms containing b to the left, all other terms to the right
-b=-5
b=-5/-1
b=+5
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