Final answer:
The problem cannot be solved with the provided information. It lacks the necessary geometric data to determine the value of x in the context of similar triangles ∆HCN and ∆BMD.
Step-by-step explanation:
The question provided is insufficient to solve for x as there is no specific mathematical or geometric equation or set of information provided. The chapter and section references appear to cover different subjects including chemistry equations and concentrations but do not provide the necessary information on triangle similarity to solve for x in the context of similar triangles ∆HCN and ∆BMD.
To solve for x in similar triangles, one would typically use the properties of similar triangles that state corresponding sides are proportional. Without any measurements or ratios, the value of x cannot be determined from the given information.