To solve the expression \((p−3)−(2.4+2p)\), we'll use the properties of operations to simplify it.
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Start with the expression: \[ (p - 3) - (2.4 + 2p) \]
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Distribute the negative sign across the second part of the expression: \[ p - 3 - 2.4 - 2p \]
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Combine like terms: \[ (p - 2p) + (-3 - 2.4) \] This simplifies to: \[ -p - 5.4 \]
Therefore, the final answer is: \[ \boxed{-p - 5.4} \]