4. (3 points) The school's sports room bought some soccer balls and basketballs. Xiao Qiang counted and found that the number of soccer balls is 3 times the number of basketballs plus 4; counting again, he found that the number of soccer balls is also 2 less than 4 times the number of basketballs. The total number of soccer balls bought is $\qquad$.
【Answer】Solution: According to the analysis of the question, we get: $(4+2) \times 3+4=22$ (individuals), Answer: The football header was performed 22 times.

Therefore, the answer is: 22.