$$2^{-3}-3=\frac{1}{2^3}-3=\frac{1}{8}-3=-2\frac{7}{8}$$
Your pic... It is a dark red car!! Maybe those glasses of yours are a tad too dark! :/
Are you trying to confuse the h**l out of me? It is working !! :))
What are you talking about??? I am looking at a shiny new car !@@
It takes me a maximum of 4 weighings. (could get lucky and do it quicker)
Almost the same as equations
except, you turn the sign around
1) if you mult or div by a neg number
2) if you swap sides
3) if you take reciprocals
I am a little confused as to how this is a pic of the situations Chris, LOL
You got into a mess MG,
x-x=0 !!
and
2x-x+17=x+17
If you subtract a negative the it is a plus
It is like if you take cold air out of a room, the room gets hotter !
Use the calc on the home page :)
ln(10) that is the answer
+118723 
(could get lucky and do it quicker)