-11b+7=40 how do we solve for b?

We want to find the unknown value b in the following equation

-11b + 7 = 40

Since both sides are the same we can substract 7 both sides and it will be true

-11b + 7 - 7 = 40 - 7

-11b + 0 = 33

-11b = 33

We want to have just b in one side of the equation, we can divide both sides by -11, since they are equal:

-11b = 33

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.