b=20-2b

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Solution for b=20-2b equation: 



b=20-2b

We move all terms to the left:

b-(20-2b)=0

We add all the numbers together, and all the variables

b-(-2b+20)=0

We get rid of parentheses

b+2b-20=0

We add all the numbers together, and all the variables

3b-20=0

We move all terms containing b to the left, all other terms to the right

3b=20

b=20/3

b=6+2/3

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