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An equation is equal if you have a math problem on each side of an equal sign.

Q: How is an equation equal?

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If it doesn't have an equal sign, then it's not an equation.

An expression has no equal sign whereas an equation does have an equal sign

Equality. If they are ALWAYS equal then the equation is an identity.

An equation has an equal sign, a expression does not.

An equation states that the two quantities on each side of the equal sign are equal.

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Never. By definition, the two sides of an equation are equal.

If it doesn't have an equal sign, then it's not an equation.

An equation

An expression has no equal sign whereas an equation does have an equal sign

Equality. If they are ALWAYS equal then the equation is an identity.

That is the definition of the term "equation".

A mathematical sequence whose verb is equal is the definition for an equation. An equation is given in the form A is equal to B. An equation can contain numbers and variables.

Equation: x+3=3+x (notice the equal sign: equal; equation)Expression: x+3 (notice no equal sign)

Equation: x+3=3+x (notice the equal sign: equal; equation)Expression: x+3 (notice no equal sign)

An equation must have an equal (=) sign and both side are the same, that is, equal to each other.

An equation that states that two ratios are equal is a proportion.

An equation has an equal sign, a expression does not.