Can someone check to see if im doing this correct? Thanks!!! Look at pic

Answer:
x = 12
Step-by-step explanation:
35 and 4x + 7 form a right angle , then
4x + 7 + 35 = 90 , that is
4x + 42 = 90 ( subtract 42 from both sides )
4x = 48 ( divide both sides by 4 )
x = 12