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-4b+15=2b-b
We move all terms to the left:
-4b+15-(2b-b)=0
We add all the numbers together, and all the variables
-4b-(+b)+15=0
We get rid of parentheses
-4b-b+15=0
We add all the numbers together, and all the variables
-5b+15=0
We move all terms containing b to the left, all other terms to the right
-5b=-15
b=-15/-5
b=+3
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