We have to find the length of the apartment in terms of x. This is, we will sum the lengths of the rooms, thus:
[tex]x+(x+5)+(2x-1)+x+(x+8)[/tex]
Simplifying, we obtain:
[tex]\begin{gathered} =x+x+5+2x-1+x+x+8 \\ =6x+12 \end{gathered}[/tex]
This means that the length of the apartment is 6x+12.
