Help me solve this please

10°

Step-by-step explanation:

Step 1:

∠EFG = 90°         Def. of Right Angle

Step 2:

∠EFH + ∠HFG = ∠EFG        Sum of an angle

Step 3:

7x + 2x = 90         Input Values

Step 4:

9x = 90        Combine Like Terms

Step 5:

x = 90 ÷ 9       Divide

x = 10°

Hope This Helps :)