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5=20-b
We move all terms to the left:
5-(20-b)=0
We add all the numbers together, and all the variables
-(-1b+20)+5=0
We get rid of parentheses
1b-20+5=0
We add all the numbers together, and all the variables
b-15=0
We move all terms containing b to the left, all other terms to the right
b=15
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