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-12b+11=13b-7
We move all terms to the left:
-12b+11-(13b-7)=0
We get rid of parentheses
-12b-13b+7+11=0
We add all the numbers together, and all the variables
-25b+18=0
We move all terms containing b to the left, all other terms to the right
-25b=-18
b=-18/-25
b=18/25
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