Given that DAB and EAC are straight lines find the value of unknown.
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y=180 - 40
because DAB is a straight line
y=140
in triangle CDA
4x + 3x + 40 =180. (angle sum property)
7x = 180 - 40
7x = 140
x=140/7
x = 20
x =20
y = 140
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