7b-12-3b=21

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Solution for 7b-12-3b=21 equation: 



7b-12-3b=21

We move all terms to the left:

7b-12-3b-(21)=0

We add all the numbers together, and all the variables

4b-33=0

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

4b=33

b=33/4

b=8+1/4

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