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7-30.

Simplify the following expressions. 

  1.  

    Change to addition.

    Find a common denominator.

  1.  

    Find a common denominator.

  1.  

    Refer to part (a).

  1.  

    Recall that adding a negative number is essentially subtraction.

  1.  

    Remember that when you subtract a negative number you are essentially adding it.

  1.  

    Remember, the solution will have the same sign as the larger number.