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-5(2b+1)=
We move all terms to the left:
-5(2b+1)-()=0
We add all the numbers together, and all the variables
-5(2b+1)=0
We multiply parentheses
-10b-5=0
We move all terms containing b to the left, all other terms to the right
-10b=5
b=5/-10
b=-1/2
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