You can put this solution on YOUR website!
When you are "solving" something like:
What they are asking you to do is to "isolate" the unknown (in this case, b) to one side of the equation -- doesn't matter which side.
Start by distributing the 2 to each term inside the parentheses:
Combining like-terms on the left:
7b+2 = 16
Subtracting 2 from both sides:
7b = 14
Finally, divide both sides by 7:
b = 2 (this is your answer)