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Home > AC > Chapter 14 > Lesson 14.3.1.1 > Problem 3-9
If two expressions are equivalent, they can form an equation that is considered to be always true. For example, since
If two expressions are equal only for certain values of the variable, they can form an equation that is considered to be sometimes true. For example,
If two expressions are not equal for any value of the variable, they can form an equation that is considered to be never true. For example,
Is the equation
Solve the equation. Rewrite
The equation is sometimes true; it is only true when