Resposta:  1

Explicação passo a passo:

2x+5=x+6

2x-x=6-5

x=1

[tex]\Large\displaystyle\text{$\begin{gathered} \sf{2x+5=x+6}\\\sf 2x-x=6-5\\\boxed{\boxed{\sf x=1}}\end{gathered}$}[/tex]