Two step equation

Question

jerry started doing sit-ups every day. the first day he did 15 sit-ups. Every day after that he did 2 more sit-ups than he had done the previous day. Today jerry did 33 sit-ups. write an equation that could be solved to find the number of day jerry has been doing sit-ups, not counting the first day

Answer 1

d represents the number of days

33 - 15 = 2d