Respuesta :

4b + 10 = 42
b = 8
32 + 10 = 42

[tex]4b + 10 = 42 \\ 4b = 42 - 10 \\ 4b = 32 \\ \\ b = \frac{32}{4} \\ \\ b = \frac{8}{1} \\ \\ b = 8[/tex]