find x,in the given figure
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if lines are parallel , construct another parallel line to both of them joining point of two rays forming ∠20
as 128° and angle formed by construction of line are co interior
angle formed by construction of line be 'a'
⇒∴128 + a = 180
a = 52°
a + 20 and x are also co interior
∴a+ 20 +x = 180
52+20 +x = 180
x = 180-72
∴ x=108°
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