5b+2b-7=21

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Solution for 5b+2b-7=21 equation: 



5b+2b-7=21

We move all terms to the left:

5b+2b-7-(21)=0

We add all the numbers together, and all the variables

7b-28=0

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

7b=28

b=28/7

b=4

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