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How is x + 2 - x ^ 2 + 4x + 3/x^ 2 - 9 equivalent to x ^ 2 - 2x - 7/ x - 3.                   x not equal - 3 and x not equal 3

HY80 steel has been used historically for submarine manufacture. Due to the secrecy involved with all aspects to submarine manufacture it is often difficult to obtain material information, however...

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