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) = 90

77 = 5x + 18

77 + (5x + 18) = 180

77 + (5x + 18) = 360