A-1b=-1

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Solution for A-1b=-1 equation: 



-1A=-1

We move all terms to the left:

-1A-(-1)=0

We add all the numbers together, and all the variables

-1A+1=0

We move all terms containing A to the left, all other terms to the right

-A=-1

A=-1/-1

A=1

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