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-4b-9=3b-4
We move all terms to the left:
-4b-9-(3b-4)=0
We get rid of parentheses
-4b-3b+4-9=0
We add all the numbers together, and all the variables
-7b-5=0
We move all terms containing b to the left, all other terms to the right
-7b=5
b=5/-7
b=-5/7
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