$${\mathtt{4}}{\mathtt{\,\times\,}}{\mathtt{x}}{\mathtt{\,-\,}}{\mathtt{8}}{\mathtt{\,\times\,}}{\mathtt{y}} = {\mathtt{28}} \Rightarrow {\mathtt{x}} = {\mathtt{2}}{\mathtt{\,\times\,}}{\mathtt{y}}{\mathtt{\,\small\textbf+\,}}{\mathtt{7}}$$
the x is -x=7-2y
Would the 4 be negative?
