# Why can't I apply nodal at the ground terminal of this Op amp?

This question is asked to find the value of $V_o$ in terms of $V_s$ that i already got so don't want solution for this.

I have one doubt,while applying nodal I applied nodal at the ground terminal (that red line pointing) too that gives me incorrect answer. that i did't understand why can't I apply nodal at that point?

what i understand is if I give that three branch separate ground then that will not be a node anymore.