IQR=36-16.. which would give you 20!
If two lines are crossed by another line that is called the transversal, the corresponding angles those in matching corners. In this problem, we have two parallel lines:

In this way, x° and 76° are corresponding, therefore:
(x)° = 76°
∴ x = 76
When one number is negative and the other is positive.
A.

B.

Megan's solution isn't correct.
The first mistake: she subtracted 5x from the right-hand side of the equation, but added 5x to the left-hand side.
The second mistake: she divided the right-hand side of the equation by 11, but didn't divide the left-hand side.
The correct solution: