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For the following equations, solve for . Be sure to check your answer, if possible. Show all work.  


    Subtract from both sides.

    Get the variable on a side by itself.

    Solve for .


    Follow the steps in part (a).

    How does the negative sign in front of the parentheses change what is inside?

  1. Use a diagram of the Equation Mat or some other method to explain why .

    Refer to the Math Notes box in Lesson 2.1.9 if you need more help with using an Equation Mat.