Some issues solving linear equation

[sasa]

Thank you to both.

It seems then this is fixed in recent calculators or used different method for solving...
To be more clear, matrix in both systems is singular, therefore inverse matrix is not possible to create.

However, without looking in the algorithm, it is unknown why such results are shown, nor why noted factor is used to show these results in the second example, even memory was reset, as well reopen emulator without previously saved data.