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2b-11b-(-5b)=12
We move all terms to the left:
2b-11b-(-5b)-(12)=0
We add all the numbers together, and all the variables
-9b-(-5b)-12=0
We get rid of parentheses
-9b+5b-12=0
We add all the numbers together, and all the variables
-4b-12=0
We move all terms containing b to the left, all other terms to the right
-4b=12
b=12/-4
b=-3
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