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Children's Dictionary
algebra a form of mathematics used to solve problems in which some of the numbers are not known. In an algebra problem, letters stand for the unknown numbers.
mathematics (used with a singular verb) the study of numbers, amounts, shapes, and the relationship between them, using symbols to represent these things. Arithmetic, algebra, and geometry are some branches of mathematics.
x2 an unknown number in algebra. [1/4 definitions]
y an unknown number in algebra. [1/2 definitions]