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6b+3b-21=2+5b+5
We move all terms to the left:
6b+3b-21-(2+5b+5)=0
We add all the numbers together, and all the variables
6b+3b-(5b+7)-21=0
We add all the numbers together, and all the variables
9b-(5b+7)-21=0
We get rid of parentheses
9b-5b-7-21=0
We add all the numbers together, and all the variables
4b-28=0
We move all terms containing b to the left, all other terms to the right
4b=28
b=28/4
b=7
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