What is the missing statement and the missing reason in step 5?

a 2-column table with 7 rows. column 1 is labeled statements with the entries measure of angle a d e = 60 degrees and measure of angle c d f = (3 x + 15) degrees, angle a d e and angle c d f are vertical angles, angle a d e is-congruent-to angle c d f, measure of angle a d e = measure of angle c d f, question mark, 45 = 3 x, and, 15 = x. column 2 is labeled reasons with the entries given, definition of vertical angles, vertical angles congruent, definition of congruency, question mark, subtractive property, division property.

statement: 60 = 3x + 15; reason: substitution
statement: x = 15; reason: subtraction property of equality
statement: 60 = 3x + 15; reason: transitive property
statement: x = 15; reason: subtraction and division properties of equality