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11-2b=15+2b
We move all terms to the left:
11-2b-(15+2b)=0
We add all the numbers together, and all the variables
-2b-(2b+15)+11=0
We get rid of parentheses
-2b-2b-15+11=0
We add all the numbers together, and all the variables
-4b-4=0
We move all terms containing b to the left, all other terms to the right
-4b=4
b=4/-4
b=-1
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