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The interior angles of a hexagon are 2x + 5, 4x − 5, 4x + 5, 3x, 4x −20 and 2x.
Find the value of x.

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(2x + 5) + (4x − 5) + (4x + 5) + 3x + (4x − 20) + 2x = 90(2×6−4)
19x +−15 = 720
19x = 735
x = 38.68°
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