Respuesta :

icedipping
x = 19 degrees.
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Sum of all angles in a triangle is 180°

99 +  3x + x + 5 = 180    | Sum of all the 3 angles = 180
4x + 104 = 180                | Combine like terms
4x = 76                            | take away 104 from both sides        
x = 19°                             | Divide by 4 on both sides


Answer: x = 19°