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Please help me to answer this question

Please help me to answer this question-example-1
User Kokizzu
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1 Answer

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(180-x) + 18 + 30 + x/2 = 180

=> 180 + 48 - x + x/2 = 180

=> -x/2 + 48 = 0

=> x/2 = 48

=> x = 48×2 = 96°
User Cwarny
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