Answer:
x=35
Step-by-step explanation:
vertically opposite angles are equal
3x+20=5x-50
3x-5x=-50-20
-2x=-70
divide both sides by -2
-2x/-2=-70/-2
opposite angles = equal angles
3x + 20 = 5x - 50
-2x = 70
x = 70 : 2
x = 35
