What is the value of X i don’t know how to do this

Answer:
x = 56
Step-by-step explanation:
The sum of interior angles for the given rectangle is 540 degrees
99 + 89 + 72 + 3x + 2x = 540 add like terms
260 + 5x = 540 subtract 260 from both sides
5x = 280 divide both sides by 5
x = 56