Substitution Property - How To Solve 3m = n - 7

The video tutorial presents a math problem involving finding the set of possible values for M given a set of values for N and the equation 3M = N - 7. The instructor demonstrates solving for M by isolating the variable and using substitution with the given values of N. The process involves simplifying fractions and checking against multiple-choice options. The tutorial concludes with confirming the correct answer and explaining the substitution property.

Explain the mathematical property of substitution as mentioned in the text.

What is the final set of possible values for M determined from the substitutions?