The measures of the angles of a triangle are shown in the figure below. Solve for x.
(8x-9)°
63°
70°

Answer:
x= 7
Step-by-step explanation:
Theorem: The sum of the angles of a triangle is 180
Memorize that theorem
8x - 9 + 63 + 70 = 180
8x + 124 = 180
8x = 56
x= 7