Angle F and angle H are supplementary angles.

The measure of angle F is 77º
The measure of angle H is (5x + 18)º
Which equation can be used to find the value of x?

77 + (5x + 18) = 360

77 + (5x + 18) = 90

77 = 5x + 18

77 + (5x + 18) = 180