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13b=-20+12b
We move all terms to the left:
13b-(-20+12b)=0
We add all the numbers together, and all the variables
13b-(12b-20)=0
We get rid of parentheses
13b-12b+20=0
We add all the numbers together, and all the variables
b+20=0
We move all terms containing b to the left, all other terms to the right
b=-20
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