b+21=3b+6

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Solution for b+21=3b+6 equation: 



b+21=3b+6

We move all terms to the left:

b+21-(3b+6)=0

We get rid of parentheses

b-3b-6+21=0

We add all the numbers together, and all the variables

-2b+15=0

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

-2b=-15

b=-15/-2

b=7+1/2

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