Answer:
145°
Explanation:
∠1 + ∠2 = ∠3
5x + (4x + 10) = 10x - 5
9x + 10 = 10x - 5
10x - 9x = 10 + 5
x = 15
∠3 = 10x - 5 = 10(15) - 5 = 150 - 5 = 145
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