Question: How do I rescale an equation without resizing the label

I need to insert an equation featuring a 4x4 matrix whose entries are smallish polynomials. To fit this onto the page, I found out that I could place 

\newcommand\scalemath[2]{\scalebox{#1}{\mbox{\ensuremath{\displaystyle #2}}}} 
in the preamble, and then wrap it around the math environment. It works beautifully, except for one small problem. Wrapping it around \begin{equation}    \end{equation} it also scales the number of the equation. Is there an easy fix?

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