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30b=80+15b
We move all terms to the left:
30b-(80+15b)=0
We add all the numbers together, and all the variables
30b-(15b+80)=0
We get rid of parentheses
30b-15b-80=0
We add all the numbers together, and all the variables
15b-80=0
We move all terms containing b to the left, all other terms to the right
15b=80
b=80/15
b=5+1/3
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