回答編集履歴
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追記
test
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@@ -1,27 +1,33 @@
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【追記】
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質問者さんが知りたかったのはアルゴリズムでしたね。
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勘違いしていました。
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---
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import sympy
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from sympy.abc import x
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~~式の中の変数はxのみとの前提です。~~
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left, right = fx.split('=')
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~~i~mport sympy~~
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~~from sympy.abc import x~~
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# 4
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~~fx = '1 + 3 = x'~~
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~~left, right = fx.split('=')~~
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~~fx = eval(left + '-' + right)~~
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~~print(sympy.solve(fx)[0])~~
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~~# 4~~
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