write the equation as a fraction
-z
----- >2
5
since you're diving by 5 on the side with the variable, then you want to do the opposite on the other side.
you get
-z> 10
you don't want the variable to be a negative, so you want to find the opposite of that.
the equation is now
-1z>10
(the -1 was already there, but it wasn't important until now. 1z = z because it is like 1(z)
since you are multiplying -1 to z you want to divide it from 10.
equation is now
z> -10.
since you divided by a negative just now you have to flip the sign.
equation is now
z< -10