Solving an equation with a half

Proved

WorkbookSource.problem_31073

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

lean-workbooksource-checked

Solve for $n$ when $n+2 = \frac{n}{2}$ .

Source: InternLM Lean-Workbook, record lean_workbook_31073 (Apache-2.0). The complete source proposition and explicit variable declarations are preserved.

Preamble

import Mathlib
open Real Nat

Formal statement

theorem WorkbookSource.problem_31073 (n : ℝ) : n + 2 = n / 2 ↔ n = -4  :=  by sorry

Source

https://huggingface.co/datasets/internlm/Lean-Workbook/blob/main/lean_workbook.json, record lean_workbook_31073; Apache-2.0

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