Given the expression:
[tex]y-x-x[/tex]First, you can simplify both x-terms:
[tex]y-2x[/tex]Replace the expression with the given values for y and x and solve
[tex]\begin{gathered} y-2x=4-2\cdot5 \\ 4-10=-6 \end{gathered}[/tex]The result of the expression when y=4 and x=5 is 6