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3-13.

Use the eTools below to help solve the problems.

Click the link at right for the full version of the eTool: AC 3-13a HW eTool

Flip subtraction to addition.

Remove zero pairs.

Combine like terms.

Remove an x-tile from both sides.

Add 2 to both sides.

Divide by 2 on both sides.

2x + 3 + (−x) + 1 = 2x + (−2) + x

2x + (−x) + 3 + 1 = 2x + x + (−2)

x + 3 + 1 = 2x + x + (−2)

x + 4 = 3x − 2

4 = 2x − 2

6 = 2x

3 = x

Follow the steps in part (a).

Click the link at right for the full version of the eTool: AC 3-13b HW eTool