Answer:
see below
Step-by-step explanation:
AOC = AOB + BOC angle addition postulate
150 = 2x+ 6(x-3) substitution
150 = 2x+ 6x-18 Distribution property
150 = 8x-18 Combine like terms
168 =8x Addition property of equality ( we added 18 to each side)
21 = x Division property of equality( We divided each side by 8)
