Fix div with rational numbers to fix simplify_fractions

[shashi]

Fixes https://github.com/JuliaSymbolics/Symbolics.jl/issues/968

[github-actions[bot]]

Benchmark Results

	master	7737865b629239...	t[master]/t[7737865b629239...]
overhead/acrule/a+2	1.09 ± 0.26 μs	1.1 ± 0.24 μs	0.991
overhead/acrule/a+2+b	1.09 ± 0.26 μs	1.08 ± 0.25 μs	1.01
overhead/acrule/a+b	0.351 ± 0.009 μs	0.35 ± 0.0097 μs	1
overhead/acrule/noop:Int	26.7 ± 0.4 ns	26.1 ± 0.5 ns	1.02
overhead/acrule/noop:Sym	0.0476 ± 0.0079 μs	0.0466 ± 0.0075 μs	1.02
overhead/rule/noop:Int	0.0446 ± 0.0019 μs	0.0451 ± 0.0016 μs	0.99
overhead/rule/noop:Sym	0.0594 ± 0.0032 μs	0.0586 ± 0.0029 μs	1.01
overhead/rule/noop:Term	0.0592 ± 0.0034 μs	0.0588 ± 0.003 μs	1.01
overhead/ruleset/noop:Int	0.168 ± 0.0022 μs	0.164 ± 0.0037 μs	1.02
overhead/ruleset/noop:Sym	0.202 ± 0.006 μs	0.192 ± 0.0081 μs	1.05
overhead/ruleset/noop:Term	4.44 ± 0.36 μs	4.29 ± 0.3 μs	1.04
overhead/simplify/noop:Int	0.223 ± 0.0098 μs	0.228 ± 0.0086 μs	0.98
overhead/simplify/noop:Sym	0.242 ± 0.0058 μs	0.25 ± 0.0057 μs	0.967
overhead/simplify/noop:Term	0.0438 ± 0.0036 ms	0.0457 ± 0.0037 ms	0.958
overhead/simplify/randterm (+, *):serial	0.164 ± 0.0014 s	0.166 ± 0.001 s	0.989
overhead/simplify/randterm (+, *):thread	0.114 ± 0.017 s	0.115 ± 0.017 s	0.997
overhead/simplify/randterm (/, *):serial	0.273 ± 0.0096 ms	0.283 ± 0.01 ms	0.966
overhead/simplify/randterm (/, *):thread	0.315 ± 0.01 ms	0.328 ± 0.011 ms	0.962
overhead/substitute/a	0.074 ± 0.0021 ms	0.0713 ± 0.0018 ms	1.04
overhead/substitute/a,b	0.0649 ± 0.0021 ms	0.0629 ± 0.0018 ms	1.03
overhead/substitute/a,b,c	23.6 ± 0.8 μs	21.9 ± 0.7 μs	1.08
polyform/easy_iszero	0.0387 ± 0.0038 ms	0.0385 ± 0.0036 ms	1.01
polyform/isone	3.1 ± 0.1 ns	3.4 ± 0 ns	0.912
polyform/iszero	2.44 ± 0.034 ms	2.39 ± 0.043 ms	1.02
polyform/simplify_fractions	3.28 ± 0.043 ms	3.22 ± 0.042 ms	1.02
time_to_load	5.51 ± 0.015 s	5.49 ± 0.05 s	1

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR. Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).