Find the value of x in following figure

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Finding the missing angle of the triangle = 80?+30?+y = 180? (angle sum property)
= 110?+y = 180?
y= 180? -110? = 70?

Now finding the value of x =
70?+90?+x= 180? (linear pair)
160?+x=180?
x= 180?-160? = 20?

Therefore, the value of x is 20?
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