Sa determine x-numar natural
astfel incat:

[tex] a) \frac{x}{4 } = \frac{1}{2 \:} \: \: b) \: \frac{x + 1}{8} = \frac{5}{4} \: c) \frac{3}{2} = \frac{2x + 1}{6} \: d) \: \frac{2}{x {}^{3} } \: [/tex] = 1/4