b+2b-13+20=28

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Solution for b+2b-13+20=28 equation: 



b+2b-13+20=28

We move all terms to the left:

b+2b-13+20-(28)=0

We add all the numbers together, and all the variables

3b-21=0

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

3b=21

b=21/3

b=7

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