解方程组：

$(1)\begin{cases}3x=5y\\2x-3y=1\end{cases}$

$(2)\begin{cases}\dfrac{x}{2}+\dfrac{y}{3}=2\\2x+3y=28\end{cases}$

$(3)\begin{cases}\dfrac{x+y}{3}-\dfrac{x-y}{4}=5\\\dfrac{x+y}{3}+\dfrac{x-y}{4}=11\end{cases}$

$(4)\begin{cases}x+y+z=0\\4x+2y+z=3\\9x+3y+z=6\end{cases}$