3b-4=21-3b

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Solution for 3b-4=21-3b equation: 



3b-4=21-3b

We move all terms to the left:

3b-4-(21-3b)=0

We add all the numbers together, and all the variables

3b-(-3b+21)-4=0

We get rid of parentheses

3b+3b-21-4=0

We add all the numbers together, and all the variables

6b-25=0

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

6b=25

b=25/6

b=4+1/6

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