Fixes issue8666 solvers
Add AMiT Kumar to AUTHORS/aboutus. Welcome to SymPy!
Parial fix for issue #8677: exclude early exit in equals() for Mod
Add Nishith Shah to AUTHORS/aboutus. Welcome to SymPy!
Merge pull request #8687 from skirpichev/8677-fix1

Parial fix for issue #8677: exclude early exit in equals() for Mod
Merge pull request #8686 from smichr/auth

Auth
both lhs and rhs should be checked in solve
Merge pull request #8684 from aktech/issue8666

Solve returns correct solution for Equations where denominator becomes 0 (fixes #8666)