# Question #42928

Oct 29, 2017

When dealing with algebraic expressions or equations, you can usually double check my answer by substituting the answer you obtained back into the original expressions or equations.

#### Explanation:

Example if: $3 x - 12 = 2 x \to$

$3 x - 2 x - 12 + 12 = 2 x - 2 x + 12$

$3 x - 2 x \cancel{- 12} + \cancel{12} = \cancel{2 x} \cancel{- 2 x} + 12 \to$

$x = 12$ [ANS]

Then we can check the solution by substituting [ANS] into the given equation.

$3 x - 12 = 2 x \to$

$3 \left(12\right) - 12 = 2 \left(12\right)$

$36 - 12 = 24$

$24 = 24$ {Check]

If you are looking at the check box below, you will use that when you have published an answer you re unsure of, and another Socratic member will check it for you.