Update app.py

app.py

@@ -131,7 +131,7 @@ def inequality_solver():
         solution = solve(inequality, x)
         
         st.subheader("不等式の解")
-        st.write(solution.replace("& (x < oo)",""))
+        st.write(str(solution).replace("& (x < oo)",""))
 
 if __name__ == "__main__":
     main()