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I would like to solve equation with x=a-1*b but when I inverse matrix A . It is bad solution to solve (I use mathematica to solve it)(Attach matrix A in excel file).

I want to know why matrix A is bad solution when I inverse???????

If I want to solve this equation. How i can do?

I want to know why matrix A is bad solution when I inverse???????

If I want to solve this equation. How i can do?

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