I guess you mean
x = 10
y = -2
z = -5
then
x^2 = 100
6 z = 30
so you have
(-100 + 30) / -2
= -70 / -2
= 35
x = 10 y = -2 z = -5
-x^2 + 6z
--------------
y
2 answers
whoops 6 z = -30
(-100 - 30) / -2
= -130 / -2
= 65
(-100 - 30) / -2
= -130 / -2
= 65