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What is the value of x?

What is the value of x?-example-1
User Frustrated
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71 = 28 + x

x = 71 - 28

x = 43
User John Weldon
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y - the angle adjacent to the angle 71


x=180-28-y=152-y\\ y=180-71=109\\ \Downarrow\\ x=152-109=\boxed{43}
User Chargaff
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