Merge pull request #550 from JuliaSymbolics/s/fix-Rational-div #781

Job	Run time
ModelingToolkit.jl/All	40m 23s
Catalyst.jl/All	29m 50s
NeuralPDE.jl/NNPDE	28m 53s
DataDrivenDiffEq.jl/Standard	21m 9s
Symbolics.jl/All	9m 24s
ModelOrderReduction.jl/All	26s
	2h 10m 5s

Provide feedback