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12b-1=13b-19
We move all terms to the left:
12b-1-(13b-19)=0
We get rid of parentheses
12b-13b+19-1=0
We add all the numbers together, and all the variables
-1b+18=0
We move all terms containing b to the left, all other terms to the right
-b=-18
b=-18/-1
b=+18
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