Respuesta :

[tex]\begin{gathered} 2(b+4)-3=17 \\ \text{open te bracket} \\ 2b+8-3=17 \\ 2b+5=17 \\ 2b=17-5 \\ 2b=12 \\ b=\frac{12}{2} \\ b=6 \end{gathered}[/tex]