Solve for z, W, a, d, b, c
z=0\text{, }W\neq 0\text{, }a=0\text{, }d\neq 0\text{, }b=0\text{, }c=0
z=\frac{Wa}{d}\text{, }W\neq 0\text{, }a\neq 0\text{, }d\neq 0\text{, }b=\frac{Wa}{d}\text{, }c=\frac{Wa}{d}
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