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-4b+13=7b+9
We move all terms to the left:
-4b+13-(7b+9)=0
We get rid of parentheses
-4b-7b-9+13=0
We add all the numbers together, and all the variables
-11b+4=0
We move all terms containing b to the left, all other terms to the right
-11b=-4
b=-4/-11
b=4/11
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