Ok, so. I know It’s -27 + 23x and X = 7 right?? Or am I doing something wrong.

Answer:
134 degrees
Step-by-step explanation:
Right so far. To find the numerical measure of the angle, you need to use x=7 in your expression for the angle measure:
m∠STU = -27 +23(7) = 134 . . . degrees