Giải các hệ phương trình sau :
a) \(\left\{{}\begin{matrix}4x+y=-5\\3x-2y=-12\end{matrix}\right.\);
b) \(\left\{{}\begin{matrix}x+3y=4y-x+5\\2x-y=3x-2\left(y+1\right)\end{matrix}\right.\);
c) \(\left\{{}\begin{matrix}3\left(x+y\right)+9=2\left(x-y\right)\\2\left(x+y\right)=3\left(x-y\right)-11\end{matrix}\right.\);
d) \(\left\{{}\begin{matrix}2\left(x+3\right)=3\left(y+1\right)+1\\3\left(x-y+1\right)=2\left(x-2\right)+3\end{matrix}\right.\).