(-3,5): \frac{4}{x} = -3 |*(-1)
\frac{35}{10}*\frac{x}{4}=3
\frac{7}{2}*\frac{x}{4}=3
\frac{7}{8}x=3
x=3:(\frac{7}{8})
x=3*\frac{8}{7}
x=\frac{24}{7}
sprawdzenie
-3,5:\frac{4}{\frac{24}{7}}=-3,5:4*\frac{7}{24}=-3,5:\frac{28}{24}=-3,5*\frac{24}{28}=-\frac{84}{28}=-3