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30=50-b
We move all terms to the left:
30-(50-b)=0
We add all the numbers together, and all the variables
-(-1b+50)+30=0
We get rid of parentheses
1b-50+30=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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