## Answers

See a solution process below:

#### Explanation:

First, expand all of the terms in brackets and parenthesis on each side of the equation:

Because both sides of the equation are the same,

Or

- An equation satisfied by every number that is a meaningful replacement for the variable is called an identity.
- An equation satisfied by some numbers but not others, such as 2x =4, is called a conditional equation.
- An equation that has no solution, such as x = x +1, is called a contradiction.

Because this equation is satisfied by every number that is a meaningful replacement, this equation is an **identity**.

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