50 POINTS!!! A side of the triangle below has been extended to form an exterior angle of 148°. Find the value of x.

Sum of two Interiors=Exterior
[tex]\\ \rm\rightarrowtail x+90=148[/tex]
[tex]\\ \rm\rightarrowtail x=148-90[/tex]
[tex]\\ \rm\rightarrowtail x=58[/tex]
First, let's find the interior top angle of the triangle.
Let the top angle be "y".
We know that:
This means that:
Simplify the equation by subtracting 148 both sides to isolate "y".
Hence, the top angle of the triangle is 32°.
We know that:
This means that:
Substitute "Right angle" as 90.
Subtract 122 both sides to isolate x.
Thus, the measure of x is 58°.