Answer:
x = 12
Step-by-step explanation:
The angle formed by two chords is half the sum of the intercepted arc angles.
m∠UST = ½ (mVL + mUT)
5x + 18 = ½ (66 + 8x − 6)
10x + 36 = 60 + 8x
2x = 24
x = 12
5(a - b) + 6(a + b) - 7(a - 2b) = 5a-5b+6a+6b-7a+14b= 4a + 15b
1/2 × 40 = 2x + 8
⇔ 20 = 2x + 8
⇔ 12 = 2x
⇔ x = 6
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