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Amir Arad · Answer 1 · 2022-12-02T02:46:43+0000

Answer: 27

Step-by-step explanation: Half of the supplementary (180 degree) angle is 90 degrees so we know that the other half is also 90 degrees. so 3x+9=90

Subtract 9 3x=81 divide by 3

x=27

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