To eliminate a term in an equation, you can use its additive inverse. In the example you provided, for the term \(3x\) to eliminate itself to 0, you would need to add \(-3x\).
In general, for any term \(ax\) (where \(a\) is a coefficient), you can eliminate it by adding \(-ax\).
So, the term that would eliminate \(3x\) is:
\[ -3x \]
Thus, the complete expression would be:
\[ 3x + (-3x) = 0. \]