Resposta:

[tex]x = \frac{1}{14} \\ [/tex]

Explicação passo-a-passo:

[tex] \blue{( \frac{1}{2})x = \frac{1}{28} } \\ \\ \frac{1}{2}x = \frac{1}{28} \\ \\ \frac{x}{2} \\ \\ \frac{1}{2}x = \frac{1}{28} \\ \\ \frac{x}{2} = \frac{1}{28} \\ \\ 2 \times \frac{x}{2} = 2 \times \frac{1}{28} \\ \\ x = 2 \times \frac{1}{28} \\ \\ x = \frac{1}{14} \\ \\ \frac{x}{2} = \frac{1}{28} \\ \\ x = \frac{1}{14} \\ \green{resposta} \\ \red{x = \frac{1}{14}} [/tex]