Trace of matrix from its adjoint

Let $A$ be a $3\times 3$ real matrix such that $\det(A)=6$ and $$\mathrm{adj}\,A = \begin{pmatrix} 1 & -1 & 2 \ 5 & 7 & 1 \ -1 & 1 & 1 \end{pmatrix},$$ where $\mathrm{adj}\,A$ denotes the adjoint of $A$. Then the trace of $A$ equals __________ (round off to $2$ decimal places)