Feature/sympy simplify#24

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alexhagen wants to merge 8 commits intoerwanp:masterfrom

alexhagen:feature/sympy_simplify

Commits on Jan 31, 2021

non-working sympy simplification
alexhagen
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Commits on Feb 1, 2021

need a last_in_fraction command`
alexhagen
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Commits on Feb 2, 2021

working for initial example
alexhagen
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Commits on Feb 3, 2021

fixed unused letter and added to test
alexhagen
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