Respuesta :

thepingu

Answer:

[tex]\huge\boxed{x=-18}[/tex]

Step-by-step explanation:

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

Our goal is to find [tex]x[/tex]. To do this we want to isolate [tex]x[/tex] on one side of the equation

[tex]x-3=-21[/tex]

Let's add 3 to both sides.

[tex]x-3 + 3 = -21+3\\\\-3 + 3 = 0\\\\x = -21+3\\\\x=-18[/tex]

Hope this helped!

ImagineCloud

Answer:

x = -18

Step-by-step 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.

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