2b+4=3b+21

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Solution for 2b+4=3b+21 equation: 



2b+4=3b+21

We move all terms to the left:

2b+4-(3b+21)=0

We get rid of parentheses

2b-3b-21+4=0

We add all the numbers together, and all the variables

-1b-17=0

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

-b=17

b=17/-1

b=-17

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