Answer :
Given equation is
[tex]5u+27+4u=9[/tex]Now, we keep all the terms with u in the left hand side and the terms without u in the right hand side. It follows
[tex]\begin{gathered} 5u+4u=9-27 \\ 9u=-18 \\ u=-2 \end{gathered}[/tex]Hence, the solution is u=-2.