Answer: x=9
Explanation:
First we need to realize that a triangle and all 3 of its angles must equal to 180°
Let's take 67°+74=141°
Now we will take 180°-141°=39
Now we know the missing angle is 39°, but we are still unsure of what x is
So let us plug in 9
4(9)+3
36+3
39
x=9