In many technical professions, such as laboratory analysis or engineering technology, formulas often involve rational expressions. To ensure mathematical accuracy and avoid errors such as division by zero, technicians follow a standardized 5-step protocol. Arrange the following steps in the correct order to solve a rational equation.

In a professional setting, such as inventory management or logistics, solving equations with rational expressions follows a standard 5-step protocol. According to this protocol, what is the primary objective of the step 'Clear the fractions'?

In professional fields such as pharmacy technology or water quality management, technicians use a specific protocol to solve rational equations found in concentration and flow rate formulas. Match each step of this protocol with its primary objective to ensure mathematical safety and accuracy.

In a professional technical manual, the 5-step procedure for solving rational equations states that 'restricted values' (Step 1) are determined by identifying any values of the variable that would cause a denominator in the equation to equal ${}0$.

When drafting a procedural checklist for solving rational equations related to inventory models, you must include a final validation check. This step requires verifying the calculated algebraic answers against the initially identified restricted values. Any calculated answer that causes a denominator in the original equation to equal zero must be rejected. In mathematical terms, this rejected answer is known as an ________ solution.