19b+5b-21b+b=20

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Solution for 19b+5b-21b+b=20 equation: 



19b+5b-21b+b=20

We move all terms to the left:

19b+5b-21b+b-(20)=0

We add all the numbers together, and all the variables

4b-20=0

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

4b=20

b=20/4

b=5

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