Tìm x,y,z thuộc Z biết:
\(\frac{3}{x-5}=\frac{-4}{x+2}\) \(\frac{-4}{8}=\frac{x}{-10}=\frac{-7}{x}=\frac{z}{-24}\) \(-\frac{42}{7}< x< -\frac{24}{6}\)
\(\frac{x}{-2}=\frac{-8}{x}\) \(\frac{-28}{4}\le x\le\frac{-21}{7}\) \(\frac{-2}{x}=\frac{y}{3}\) \(\frac{2x-9}{240}=\frac{39}{80}\)
\(\frac{-8}{15}< \frac{x}{40}< \frac{-7}{15}\)