Assuming z is not zero, then z/z = 1, so:
$${\mathtt{Y}} = {\mathtt{\,-\,}}{\mathtt{30}}{\mathtt{\,\times\,}}{\mathtt{3.009\: \!265\: \!9}}{\mathtt{\,-\,}}{\mathtt{3.068\: \!983\: \!5}}{\mathtt{\,\times\,}}{\mathtt{2}}{\mathtt{\,-\,}}{\mathtt{1}} \Rightarrow {\mathtt{Y}} = -{\mathtt{97.415\: \!944}}$$
Assuming z is not zero, then z/z = 1, so:
$${\mathtt{Y}} = {\mathtt{\,-\,}}{\mathtt{30}}{\mathtt{\,\times\,}}{\mathtt{3.009\: \!265\: \!9}}{\mathtt{\,-\,}}{\mathtt{3.068\: \!983\: \!5}}{\mathtt{\,\times\,}}{\mathtt{2}}{\mathtt{\,-\,}}{\mathtt{1}} \Rightarrow {\mathtt{Y}} = -{\mathtt{97.415\: \!944}}$$