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7-39.

Note: Some steps may be done differently.
Be sure to check you answers by substituting them into the original equations.

Subtract 2x from both sides.

8 = x − 4

Add 4 to both sides.

12 = x

Verify that 2(12) + 8 = 3(12) − 4

Use the Distributive Property.

1.5w + 3 = 3 + 2w

Subtract 1.5x from both sides.

Subtract 3 from both sides.

Divide both sides by 0.5.

w = 0

Be sure to check your answer.

Now try parts (c) and (d) on your own.