Evaluate (complex solution)
3x-4y=-6x+ay-7\text{ and }-6x+ay-7=7
Solve for x
x=-\frac{7\left(a+8\right)}{3\left(8-a\right)}
y=-\frac{28}{8-a}\text{ and }a\neq 8
Solve for y
\left\{\begin{matrix}y=\frac{9x+7}{a+4}\text{, }&x=\frac{7\left(a+8\right)}{3\left(a-8\right)}\text{ and }a\neq 8\text{ and }a\neq -4\\y=-\frac{7}{3}\text{, }&a=-4\text{ and }x=-\frac{7}{9}\end{matrix}\right.
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