Final answer:
To find the option that is not equivalent to the equation a - 3b = 5c + 9, substitute different values for a, b, and c and check if the equation holds true.
Step-by-step explanation:
The equation a - 3b = 5c + 9 is given. To determine which of the given options is not equivalent to this equation, we can substitute different values for a, b, and c and check if the equation holds true. If any option does not satisfy the equation, then it is not equivalent. However, the provided solution and expressions about quadratic equations, combustion reactions, and formulas are not relevant to the question.