Question 921686
number: AB


A + B = 6
10B + A = 2(10A + B) - 6


Substitute B = 6 - A into the second equation.


10(6 - A) + A = 2(10A + 6 - A) - 6
60 - 10A + A = 18A + 12 - 6
60 - 9A = 18A + 6
54 = 27A
A = 2 ---> B = 4


The original number is AB = 24.