5b-84=21

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Solution for 5b-84=21 equation: 



5b-84=21

We move all terms to the left:

5b-84-(21)=0

We add all the numbers together, and all the variables

5b-105=0

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

5b=105

b=105/5

b=21

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