Latest exam Aptitude Question SOLUTION: solve: 3x/7 - 5x/3 = 2/21 21(3x/7) - 21(5x/3) = 21 (2/21) 9x - 35x = 21 - x = 21 -x/26 = 21/-1 x= =21/26 This answers is not correct; please help.