Solve simultaneously x' (t) – y (t) + z' (t) = 1 - æ (t) + y' (t) + z (t) = 1 - 1 a' (t) + y' (t) – z' (t) = 0 %3D where x (0) = 1, y (0) = 0, and z (0) = -1, find x(7).

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