Answer:
x=12
Explanation:
X=12 because we can see from the picture that the left line is drawn between parallel lines, meaning that the two angles (10x-13 and 4x+25) are supplementary, meaning that they add up to 180.
so we can now write an equation and solve it
(10x-13)+(4x+25)=180
14x+12=180
14x=168
x=12