Aliyah had $24 to spend on seven pencils. After buying them she had $10. How much did each pencil co

Aliyah had $24 to spend on seven pencils. After buying them she had $10. How much did each pencil cost?

Let the number of pencils be p. We have:
7p + 10 = 24

To solve this equation for p, we type it in our math engine and we get:
p = 2