Question

How do you simplify `2+3d+d`?

Answer 1

`4d+2`

Explanation:

In algebra you can combine all like terms (meaning they have the same variable(s)). Also a variable by itself has an unwritten 1 in front so you have
`2+3d+(1)d`

You can also look at this as `2+d(3+1)` which uses distribution