Let's simplify the expression step by step.
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Start with the initial numbers: \( 75 + (-120) + (-30) + 75 \).
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First, combine \( 75 \) and \( (-120) \): \[ 75 - 120 = -45 \]
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Next, add the result to \( (-30) \): \[ -45 + (-30) = -45 - 30 = -75 \]
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Finally, add \( 75 \) to the result: \[ -75 + 75 = 0 \]
So, the final result of the expression is \( 0 \).