Answer:
x = 30
Step-by-step explanation:
in a triangle:
The sum of two interior angles are equal to an exterior angle that is supplementary to the third interior angle
x + 16 + 4x - 49 = 9x - 153 add like terms
5x - 33 = 9x - 153 transfer like terms to the same side of equation
153 - 33 = 9x - 5x subtract
120 = 4x divide both side by 4
30 = x
to find each angle replace x with the value we found respectively.
