Question

How do you solve 3x − 18 = 21?

Answer 1

`x = 13`

Explanation:

Re=arrange the equation so that all the x terms are on one side and all the numbers are on the other.

(Add 18 to each side)
`3x - 18 color(red)(+18) = 21 color(red)(+18)`

`3x = 39 " divide by 3"`

`x = 13`