algebraic term代数项
like terms, similar terms同类项
numerical coefficient数字系数
literal coefficient字母系数
inequality不等式
triangle inequality三角不等式
range值域
original equation原方程
equivalent equation同解方程，等价方程
linear equation线性方程(e.g.5x+6=22)
有关集合
union并集
proper subset真子集
solution set解集
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