Which of the following is important to do when vising a college
a. bringing copies of your high school transcripts to give to the registrar
b. bringing letters if recommendation to give an admissions representative
c. meeting with a representative of the academic department you are interested in
d. touring the departments for every major the school offers

The answer is C, although the other options are important as well, in this case, C is the answer you are looking for

if triangle abc is congruent to triangle def, their interior angles are congruent, because congruent parts of congruent triangles are congruent (cpctc).

that means ∠d is congruent to ∠a; ∠d is equal to 8x - 2.

interior angles of all triangles add to equal 180 degrees, so you can set the sum of these interior angle values equal to 180 and solve for x.

180 = (8x - 2) + 22 + 72

180 = 8x - 2 + 22 + 72

180 = 8x + 92

88 = 8x

11 = x

x = 11