To solve this equation, we will first simplify the left side of the equation and then solve for "b."

80b - 270 + 340 = 800

Next, combine like terms:

80b + 70 = 800

Now, isolate the term with "b" by subtracting 70 from both sides:

80b = 730

Finally, divide both sides by 80 to solve for "b":

b = 9.125

Therefore, the solution to the equation is:

b = 9.125