Question

find an angle such that 3 times the complement of the angle is 50 degrees greater than the supplement of the angle find an angle such that 3 times the complement of the angle is 50 degrees greater than the supplement of the angle @Mathematics

Answer 1

I'm not positive, but I think you can set it up like this:
Angle=x
3(90-x)-50=180-x
Then solve for x

Answer 2

270-3x-50=180-x
40=2x
x=20

Answer 3

let the angle be X
3(90-X) = (180-X) +50
solving X = 20