Final answer:
To determine the value of x and the measures of the two angles m<ABC = 78°, we need additional information or context.
Step-by-step explanation:
To determine the value of x and the measures of the two angles m<ABC = 78°, we need additional information or context. The question seems to be unrelated to the information provided in the solution section. Please provide more details or restate the question to receive a correct and specific answer.