Simultaneous Linear Algebraic Equation
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Nine Chapters

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Chinese mathematicians have known about how to solve simultaneous linear algebraic equations of any order as early as the Han Dynasty.

Chapter 8, Question 1 of Nine Chapters not only explained the method, it also post the following example equations:

3 x + 2 y +    z = 39
2 x + 3 y +    z = 34
   x + 2 y + 3 z = 26

The answers are given as: x = 9 1/4, y = 4 1/4, z = 2 3/4

The original Chinese text shown below.