A circle with four points S, T, U, V are on the circumference to form a quadrilateral. The measure of angle U V S is 8 x degrees, the measure of angle V S T is c degrees, the measure of angle S T U is 10 x degrees, and the measure of angle T U V is left-parenthesis 2 c minus 6 right-parenthesis degrees.
find the value of x
