b-8+4b=21

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Solution for b-8+4b=21 equation: 



b-8+4b=21

We move all terms to the left:

b-8+4b-(21)=0

We add all the numbers together, and all the variables

5b-29=0

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

5b=29

b=29/5

b=5+4/5

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