Here is a thread in paper references demonstrating that current deep learning, especially transformers are amazingly powerful for symbol manipulation already:
A paper by Dennis Lee et al (from our team) demonstrating that latent representation of formulas can be used to perform long chains of non-trivial reasoning purely using vectors:
One of the first papers that demonstrates the most tasks relevant for high level mathematics can be trained in an unsupervised manner from existing mathematical formulas, including conjecturing and finding missing proof steps: