Question

How do you solve `3x + 9x = 60`?

Answer 1

The final answer would be `x=5`

Explanation:

First of all, you would combine like terms. 3x and 9x are like terms, so you would combine them to get 12x. You would have `12x=60` and we get rid of 12 that is multiplying x by dividing 12 on both sides. 12x divided by 12 would result in 1x, or just x. 60 divided by 12 would result in 5, and you would get the answer, `x=5`.

Answer 2

`3x+9x=60`
`12x=60`
`x=5`

Explanation:

Since both of the values 3x and 9x have only one x, you are able to add them.

For example:
If you suppose `x = 1` (or any number really), you could solve `12x` or `3x+9x` and get the same answer.

Once you add these two values you have the formula:
`12x = 60`

You divide both sides by 12:
`(12x)/12=60/12`

The Twelves both cancel on the left and you are left with:
`x=60/12`

Once you simplify this you arrive at your answer:
`x=5`