find the unknown angle in the following figure. Eloborate ur ans. See that it is clear.
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HERE IS YOUR ANSWER
1st look at triangle ACD
lets apply exterior angle property
I am representing angle with this symbol--> /
/ACB=/CAD +/ADC
75=20+/ADC
/ADC= 75-20
/ADC= 55 DEGREES
now look at triangle ABD
AB=AD (given)
so triangle ABD is isoceles
therefore /ABC=/ADC
x=55 degrees
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