Which of the following expressions is equivalent to -5.4 - (2.1 + 1.8)? -5.4 - (2.1 - 1.8)
-5.4 - (-2.1 - 1.8)
-5.4 + (-2.1 + 1.8)
-5.4 + -(2.1 + 1.8)

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