Final answer:
The equation that helps find the measure of ∠m is x = 78.
Step-by-step explanation:
The equation that would help find the measure of ∠m is x = 78.
To solve for ∠m, we need to find the value of x. The equation x = 78 represents the value of ∠m.
By substituting x = 78 into the equation, we can find the measure of ∠m.