Running math expressions in Python

[summer kraken]

This is a homework question. In my screenshot, you can see each of the expressions that I have tried and I am always getting an error. Could someone please point me in the right direction?

[limber belfry]

assignments work like

var = expression

So you'll have to move the =x to the other side, e.g x=

[summer kraken]

Thank you so much! It solved everything