In ΔFGH, \text{m}\angle F = (3x-15)^{\circ}m∠F=(3x−15)

∘

, \text{m}\angle G = (8x+8)^{\circ}m∠G=(8x+8)

∘

, and \text{m}\angle H = (2x+18)^{\circ}m∠H=(2x+18)

∘

. What is the value of x?x?