Yes.
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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
An equation is equal if you have a math problem on each side of an equal sign.
an equation
Yes, when the inequality has a less that or equal to sign, or a greater than sign or equal to sign, then the equal sign can be replaced and get a solution that is common to both the equation and the inequality. There can also be other solutions to the inequality, where as the solution for the equation will be a valid one.