Which equation represents the statement, “6 less than a number is 21?”

Alex drew a circle with right triangle prq inscribed in it, as shown below: the figure shows a circle with points p, q, and r on it forming an inscribed triangle. side pq is a chord through the center and angle r is a right angle. arc qr measures 80 degrees.

3382-299=3383- ? fill in the blank?

W-16=-12 solve each one step equation plz