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-2b+13=9b+7
We move all terms to the left:
-2b+13-(9b+7)=0
We get rid of parentheses
-2b-9b-7+13=0
We add all the numbers together, and all the variables
-11b+6=0
We move all terms containing b to the left, all other terms to the right
-11b=-6
b=-6/-11
b=6/11
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