Question: Solve the given system by back substitution. x 1 + x 2 - x 3 - x 4 = 1 x 2 + x 3

Solve the given system by back substitution.
x1 + x2 - x3 - x4   = 1

        x2 + x3 + x4 = 0

                x3 - x4 = 0

                       x4 = 1

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