The phrase "equal importance" means that two or more things are equally significant or valuable. There is no preference or priority given to any particular thing; they are all considered important in the same way. Full definition
The cover letter and thank you letter are of equal importance in your presentation of your candidacy for a teaching position. (resumes-for-teachers.com)
The submission of your resume is of just as equal importance as compiling it. (resumeformat.org)
The mission of the college placed equal importance on academics, work, play, and community. (britannica.com)