need help asap its “equation practice with angle addition”

Answer:
m∠CBD = 68°
Step-by-step explanation:
Step 1: Find x.
[tex]4x + 52 + 8x - 10 = 90\\12x + 42 = 90\\12x = 48\\x = 4[/tex]
Step 2: Plug it in the angle in question.
[tex]4(4) + 52\\16 + 52\\68[/tex]