Question

X - 3= -21
This is so confusing:(​

Answer 1

x = -18

Explanation:

x - 3 = -21

add 3 to both sides

x - 3 + 3 = -21 + 3

x = -18

sidenote: you can add anything to both sides of an equation, and it'll still be true. for example, 2 = 2, if you add 1 to both sides you get 3=3 which is still true.

Answer 2

`\huge\boxed{x=-18}`

Explanation:

In order to solve this, we are trying to find the value of
`x`. Basically,
`x` is a placeholder for a number that is unknown. Some number minus 3 is equal to 21.

Our goal is to find
`x`. To do this we want to isolate
`x` on one side of the equation

`x-3=-21`

Let's add 3 to both sides.

`x-3 + 3 = -21+3\\\\-3 + 3 = 0\\\\x = -21+3\\\\x=-18`

Hope this helped!