Solving a natural-number equation

Proved

WorkbookSource.problem_26643

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

lean-workbooksource-checked

Find the value of $x$ in the equation $2x + 5 = 17$ .

Source: InternLM Lean-Workbook, record lean_workbook_26643 (Apache-2.0). The complete source proposition and its explicit variable declarations are preserved.

Preamble

import Mathlib
open Real Nat

Formal statement

theorem WorkbookSource.problem_26643 (x : ℕ) (h : 2 * x + 5 = 17) : x = 6  :=  by sorry

Source

https://huggingface.co/datasets/internlm/Lean-Workbook/blob/main/lean_workbook.json, record lean_workbook_26643; Apache-2.0

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