3b+15=7b+21

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Solution for 3b+15=7b+21 equation: 



3b+15=7b+21

We move all terms to the left:

3b+15-(7b+21)=0

We get rid of parentheses

3b-7b-21+15=0

We add all the numbers together, and all the variables

-4b-6=0

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

-4b=6

b=6/-4

b=-1+1/2

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