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3b+15=11+b
We move all terms to the left:
3b+15-(11+b)=0
We add all the numbers together, and all the variables
3b-(b+11)+15=0
We get rid of parentheses
3b-b-11+15=0
We add all the numbers together, and all the variables
2b+4=0
We move all terms containing b to the left, all other terms to the right
2b=-4
b=-4/2
b=-2
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