Intersecting a curve in an abelian variety with multiples of another curve

Levin asked what can be said about the locus of points lying on a given curve in ${\mathbb{G}}_m^n$ that have a non-zero integer multiple on another given curve in ${\mathbb{G}}_m^n$ for $n\ge 3$. We give a definite answer to the abelian analogue of Levin’s question, proving what is predicted by the Zilber–Pink conjecture in this case. An important ingredient in our proof is a strengthening of a height inequality by Vojta and Rémond.