Solve: $\left\{ \begin{array} { l }
5 a + 5 b - 3 c + 9 d = - 6 \
3 a - 9 b - 9 c - 2 d = - 11 \
6 a - 3 b + 6 c + 9 d = - 9 \
a - b + c + d = - 2
\end{array} \right.$

Question

Solve: $\left\{ \begin{array} { l } 
5 a + 5 b - 3 c + 9 d = - 6 \
3 a - 9 b - 9 c - 2 d = - 11 \
6 a - 3 b + 6 c + 9 d = - 9 \
a - b + c + d = - 2
\end{array} \right.$

Quizplus · Accepted Answer

The Answer of Solve: $\left\{ \begin{array} { l } 
5 a + 5 b - 3 c + 9 d = - 6 \
3 a - 9 b - 9 c - 2 d = - 11 \
6 a - 3 b + 6 c + 9 d = - 9 \
a - b + c + d = - 2
\end{array} \right.$