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20b-20=12+18b
We move all terms to the left:
20b-20-(12+18b)=0
We add all the numbers together, and all the variables
20b-(18b+12)-20=0
We get rid of parentheses
20b-18b-12-20=0
We add all the numbers together, and all the variables
2b-32=0
We move all terms containing b to the left, all other terms to the right
2b=32
b=32/2
b=16
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