Answer :
Given the below expression;
[tex]\frac{x-12}{y}+z[/tex]Let's go ahead and evaluate when x = -23, y= -5 and z = -10;
[tex]\begin{gathered} \frac{(-23)-12}{(-5)}+(-10)_{} \\ \end{gathered}[/tex]Let's clear off the parentheses being mindful of the signs;
[tex]\begin{gathered} \frac{-23-12}{-5-10} \\ =\frac{-35}{-15} \\ =\frac{7}{3} \end{gathered}[/tex]Therefore, the answer is 7/3.