Explanation:
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I am giving you a hint
sum of all angles in a triangle is 180 degrees use this hint to solve
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Answer:
The value of x = 8
The sum of angles of a triangle = 180°
=> 65° + 76° + 6x - 9 = 180°
=> 132° +6x = 180
=> 6x = 180 - 132
=> 6x = 48
=> x = 48/6
=> x = 8
and
(6x-9) = 6(8) -9 = 48-9 = 39
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