Abcd is a cyclic quadrilateral such as angle a equal to 4 y + 20 degree angle b is equal to 3 minus 5 angle c is equal to 4x and angle is equal to 7 x + 5 find the four angles
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a=4y+20,b=3y-5,c=4x,d=7x+5
now, abcd a quadrilateral
ab=y+15,cd=11x+5
abcd=11xy+20
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