Question 27223
                                                                                 AngleT = 16x - 9 degrees
 AngleU =  4x + 3 degreen
 Given that T and U are compimentary
 Therefore  T + U = 90 degrees
 That is  (16x - 9) + (4x + 3 ) = 90
By addititve associativity and commutativity, we have
 (16x + 4x) + ( -9 + 3 ) = 90
  20x  - 6  = 90
  20x  = 90 + 6 (by transposing, that is change side, then change sign)
  20x  = 96
   x   = 96/20 = 4.8 
Therefore Angle T = 16x - 9 = 16x4.8 - 9 = 76.8 - 9.0 = 67.8 degrees
      And Angle U = 4x + 3 =   4x4.8 + 3 = 19.2 + 3.0 = 22.2 degrees
Verification:
T and U are Complimentary
T + U = 67.8 + 22.2 = 90 which is correct