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Which procedure can be used to solve the equation 540 = 12 z, and what is the solution?

1.Multiply both sides by 12; the solution is 6,480.
2.Multiply 12 z by 12; the solution is 540.
3.Divide both sides by 12; the solution is 45.
4.Divide 12 z by 12; the solution is 540.