Do you have a picture or something to know exactly what you mean? Because this Is confusing
angle TS = 74°
Straight line is 180°, so add PT and SR
(64+42 = 106)
Subtract 180 from 106, you get 74 :)
90-69=21 degrees. This is our target answer. We'll write an equation to do this:
2x-1=21
Add 1 to each side to get:
2x=22
Divide by 2 to get that x=11
Plugging this in, we see that 2(11)-1+69=90, so our answer is correct.
:)