一次方程求解器 — 公式

## How to Solve a Linear Equation

### Formula

Given **ax + b = c**, solve for x:

**x = (c - b) / a**

1. Subtract b from both sides: ax = c - b
2. Divide both sides by a: x = (c - b) / a

This works for any linear equation with a single unknown, as long as a is not zero.