Multiple Choice

A water quality technician is solving the equation y−7=−14\frac{y}{-7} = -14 to determine the initial concentration level (yy) of a water sample before a specific treatment. After calculating that the solution is y=98y = 98, the technician must perform a check by substitution to verify the result. Which of the following equations correctly shows the substitution step?

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Updated 2026-09-18

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