Lexi is balancing equations. she is finding one equation to be very difficult to balance. which explains how to balance the equation znso4 + li2co3 → znco3 + li2so4?

If you look at the equation closely the equation is already balanced. You need to make sure that on both sides of the equation the number of atoms each chemical has should be equal: 
1. Zn has 1 atom on both sides
2. Li has 2 atoms on both
3. S has 1 atom
4. O has 7 atoms 
5. C has 1 atom 

It would be a rusting car, for sure