- linear equation in two unknowns
- 二元: binary; dual; dualistic
- 二元一次方程式: first degree in two variable equation
- 二元一次方程；二元线性方程: linear equation in two unknowns
- 一元一次方程式: simple equation
- 一次方程: equation of the first degree; equationofthefirstdegree; first order equation; first-order equation; linear equation; simple equation
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