Which of the following can be used to correctly solve the equation -1/3x=18?
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1. Multiply both sides of the equation by -1/3
2. Divide both sides of the equation by -1/3
3. Multiply both sides of the equation by -3
4. Divide both sides of the equation by -3
5. Add 1/3 to both sides of the equation
6. Subtract 1/3 from both sides of the equation