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2b+9=4b+
We move all terms to the left:
2b+9-(4b+)=0
We add all the numbers together, and all the variables
2b-(+4b)+9=0
We get rid of parentheses
2b-4b+9=0
We add all the numbers together, and all the variables
-2b+9=0
We move all terms containing b to the left, all other terms to the right
-2b=-9
b=-9/-2
b=4+1/2
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