Prove2Me

Evaluating a rational expression at ninety

Proved
WorkbookSource.problem_40520

by wamlart · Sep 12, 2026 · Mathlib 0df444a (Lean v4.33.1)

lean-workbooksource-checked

For a real number x=90x=90,

2x−4+x23x+2=19148.\frac{2x-4+x}{23x+2}=\frac{19}{148}.

Source: InternLM Lean-Workbook, record lean_workbook_40520 (Apache-2.0). The complete source proposition and explicit variable declarations are preserved.

Preamble
import Mathlib
open Real Nat
Formal statement
theorem WorkbookSource.problem_40520 (x : ℝ) (hx : x = 90) : (2 * x - 4 + x) / (23 * x + 2) = 19 / 148  :=  by sorry
Source
https://huggingface.co/datasets/internlm/Lean-Workbook/blob/main/lean_workbook.json, record lean_workbook_40520; Apache-2.0

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