PLS ANSWER THE FOLLOWING QUESTION
AND I'LL MARK U AS BRAINLIST
STEP BY STEP EXPLANATION NEEDED

Answer:
140+x+x = 180°(co-interior angle)
140+2x=180°
2x=180°-140°
2x = 40°
x = 40°/2
x = 20°
check:
140+20+20 = 180
180=180