A box had x pencils. Then 6 pencils were removed from the box. The box now has 54 pencils.

A box had x pencils. Then 6 pencils were removed from the box. The box now has 54 pencils.

Removed means we subtract from the total. So Our equation is:
x - 6 = 54

To solve this equation for x, we type it in our search engine and we get:
x = 60