Answer:
x = 15
Step-by-step explanation:
4x is congruent to 45 + 15
4x = 45 + 15
simplify 4x = 60
divide both sides by 4 x = 15
4x is the vertical angle to the sum of 45 and 15 so they are equal
4x = (45+15)
4x = 60
Divide each side by 4
4x/4 = 60/4
