Du to the triangle is an Equilateral triangle, both angles are equal. Now we have a straight angle RTU which equals 180 degrees so, <RTS + <STU = 180 5x + 5x -30 = 180 10x = 210 x = 21
cam got it wrong because cam should have used -2 as his division since the factor was x-3 to be specific in the fator x is a positive but the 2 is a negative but he put a positive 2