Let's simplify the expression \(-3(u+2)+4(2u-6)\) step by step.
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Distribute \(-3\) into \((u+2)\): \[ -3(u) - 3(2) = -3u - 6 \]
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Distribute \(4\) into \((2u-6)\): \[ 4(2u) - 4(6) = 8u - 24 \]
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Now, combine the results from steps 1 and 2: \[ -3u - 6 + 8u - 24 \]
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Combine like terms:
- Combine the \(u\) terms: \(-3u + 8u = 5u\)
- Combine the constant terms: \(-6 - 24 = -30\)
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So the expression simplifies to: \[ 5u - 30 \]
Thus, the simplified form of the expression is \(\boxed{5u - 30}\).