Question

|3x+9|= 30

Answer: x=7, -13

Answer 1

`\boxed{x=7, \: x=-13}`

Explanation:

`|3x+9|= 30`

Solve for absolute value.

There are two possibilities.

One possibility:

`3x+9=30\\3x=21\\x=7`

Second possibility:

`3x+9=-30\\3x=-39\\x=-13`