Verified answer

[tex]a) \: 5x - 20 = 26 \\ 5x = 26 + 20 \\ 5x = 46 \\ x = \frac{46}{5} \\ x = 9.2 \\ \\ \\ b) \: 2x + 9 = 11 \\ 2x = 11 - 9 \\ 2x = 2 \\ x = \frac{2}{2} \\ x = 1[/tex]

Espero ter ajudado!