Answer:
x = 12
Explanation:
For q and r to be parallel, then
11x - 28 and 7x - 8 are same-side interior angles and sum to 180° , so
11x - 28 + 7x - 8 = 180 , simplify left side
18x - 36 = 180 ( add 36 to both sides )
18x = 216 ( divide both sides by 18 )
x = 12