All I know is that a theory is a hypothesis that has been proven correct many times. So based on that if it is a scientific theory that has been proven correct many time by many people and now it is being challenged because maybe something new was discovered. That doesn't always mean it is not a good theory.
X + 2x + 5 = 62 which can be turned into. 3x + 5 = 62 -5 -5 now we subtract 5 from each side 3x = 57 /3 /3 now we divide 3 from each side to get... x = 19. Now to check 19 + (2 x 19) + 5 does in fact equal 62. Jenny is 19 years old. Hope this helped.
