If the measure of angle DCE= 4x+15 and the measure of angle ECF = 6x-5, find x and the measure of angle DCE x =?
measure of angle DCE = ?

if the measure angle FCG = 9x+3 and the measure of angle GCB = 13x-9, find x and the measure of angle GCB
x= ?
measure of angle GCB= ?​