Answer:
x = 48
Explanation:
x - 18 and the angle on the left of the triangle are alternate angles and are congruent (equal )
the sum of the 3 angles in the triangle = 180°
sum the 3 angles, equate to 180 and solve for x
x - 18 + x + 42 + 60 = 180 ( simplify left side )
2x + 84 = 180 ( subtract 84 from both sides )
2x = 96 ( divide both sides by 2 )
x = 48