Whoops, might not have been clear enough. In more mathy terms:<p>Multiplication by 2 means &quot;1 (starting point) times 2 (scaling)&quot;<p>If we &quot;do the opposite&quot; we can take the inverse of the starting point or the scaling:<p>-1 (additive inverse of starting point) times 2 = -2<p>or reverse the operation<p>1 (same starting point) * 1&#x2F;2 (scaling inverse) = 1&#x2F;2<p>Of course, we assume the scaling term is what&#x27;s being inverted, but it&#x27;s important to think about the meaning. There&#x27;s a hidden parameter for these operations and sometimes making it explicit can be helpful. (I.e., euler&#x27;s formula, e^ix, is better seen as 1.0 * e^ix. That is, you are starting at 1.0 then doing a rotation.)