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-15=4b-11
We move all terms to the left:
-15-(4b-11)=0
We get rid of parentheses
-4b+11-15=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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