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Answer:
74°
Step-by-step explanation:
m(arc)JKL = 2 × 99° = 198°
8x - 6 + 12x + 4 = 198
20x - 2 = 198
20x = 200
x = 10
m(arc)KJ = 8x - 6 = 8(10) - 6 = 74°