Find the fraction of all items that are long-sleeve shirts by multiplying the ratios.<br><br>
Let the total number of items be \(7u\) (shirts \(4u\), pants \(3u\)).<br>
&bull; Long-sleeve shirts = \(\frac{2}{2+3}\) of shirts = \(\frac{2}{5} \times 4u = \frac{8u}{5}\).<br>
&bull; Fraction of all items = \(\frac{8u}{5} \div 7u = \frac{8u}{5} \times \frac{1}{7u} = \frac{8}{35}\).<br><br>
Final Answer: \(\frac{8}{35}\)