Answer:
19°
Step-by-step explanation:
Concept Used :-
- The measure of a straight line is 180°. So the sum of angles on a straight line is 180° .
Using this ,
[tex]\bf\implies 6x + 12 + 3x - 3 = 180\\\\\bf\implies 9x + 9 = 180\\\\\bf\implies 9x = 180-9 \\\\\bf\implies x =\dfrac{171}{9} \\\\\bf\implies\boxed{\red{\bf x = 19 }}[/tex]
Hence the value of x is 19°
