Реши систему уравнений

а) \(\begin{cases}2\left(x-2y\right)-50=15x-3\left(y+10\right),\\4x+3\left(y-12\right)=5\left(2x+y\right)-36.\end{cases}\)

• \(x=\) [ ];
• \(y=\) [ ].

б) \(\begin{cases}3\left(4x-2y+1\right)-2\left(5x-y+4\right)=23,\\2\left(x+6y-9\right)+5\left(2x-4y+7\right)=105.\end{cases}\)

• \(x=\) [ ];
• \(y=\) [ ].