Find the number of solutions to a system of equations

You're going to have one solution if you can, by solving the equation, come up with something like x is equal to some number. Let's say x is equal to-- if I want to say the abstract--

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How do I find number of solution of the equation?

In case you mean to solve the under-determined system A X = B: ( 1 0 8 0 0 1 1 0 0 0 0 1) ( w x y z) = ( 1 3 1). Multiply from let with A T to get. ( 1 0 8 0 0 1 1 0 8 1 65 0 0 0 0 1) ( w
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