Answer:
x =12
Step-by-step explanation:
The sum of the angles of the triangle are 180 degrees
3x+19 + 7x-9 +50 = 180
Combine like terms
10x +60 = 180
Subtract 60 from each side
10x+60-60 = 180-60
10x = 120
Divide each side by 10
10x/10 = 120/10
x= 12
