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21=5b-24
We move all terms to the left:
21-(5b-24)=0
We get rid of parentheses
-5b+24+21=0
We add all the numbers together, and all the variables
-5b+45=0
We move all terms containing b to the left, all other terms to the right
-5b=-45
b=-45/-5
b=+9
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