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6b-43=3b+20
We move all terms to the left:
6b-43-(3b+20)=0
We get rid of parentheses
6b-3b-20-43=0
We add all the numbers together, and all the variables
3b-63=0
We move all terms containing b to the left, all other terms to the right
3b=63
b=63/3
b=21
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