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3-2b=21+7b
We move all terms to the left:
3-2b-(21+7b)=0
We add all the numbers together, and all the variables
-2b-(7b+21)+3=0
We get rid of parentheses
-2b-7b-21+3=0
We add all the numbers together, and all the variables
-9b-18=0
We move all terms containing b to the left, all other terms to the right
-9b=18
b=18/-9
b=-2
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