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7-74.

Solve each of the following equations.

  1.  

    Multiply through the equation to get rid of the fractions.
    Use a common denominator of :

    Combine like terms and solve for .

  1.  

    Multiply by and combine like terms.
    Multiplying by could also be useful to eliminate the decimals.

  1.  

    Refer to (a) for help.
    Find a common denominator and solve for .

  1.  

    Refer to (b) for help.