What would be an equation for the following story problem? There are 6 boxes of pens and 6 extra pens. There are 84 pens in all.

let number of pens in a box be x

6x + 6 = 84

Let's use the variable "x" to represent the number of pens in each box.

We can start by writing an equation based on the information given in the problem. The total number of pens in the boxes can be represented as 6x since there are 6 boxes of pens.

Additionally, there are 6 extra pens, which we can represent as + 6.

The total number of pens can be represented as 84.

Combining these equations, we have 6x + 6 = 84.

This equation can be used to find the value of "x" by solving for it.