If you think that the solution is x = 1.4 you can check that by plugging the value for x = 1.4 into 12(x - 1) = 2(x - 1):

12(1.4 - 1) = 2(1.4 - 1)

12*0.4 = 2*0.4

4.8 = 0.8 is a false statement, meaning x = 1.4 is not the solution for 12(x - 1) = 2(x - 1).

The solution is x = 1.

Indeed, if I plug x = 1 into 12(x - 1) = 2(x - 1) I get:

12(1 - 1) = 2(1 - 1)

12*0 = 2*0

0 = 0 is a true statement, meaning x = 1 is the solution for the equation 12(x - 1) = 2(x - 1).