Assertion: algebra | /r/CapableOf | substitute letter
Facets:
value: for numbers
type: PURPOSE
Source sentences:
text: Algebra is a branch of mathematics that substitutes letters for numbers, and an algebraic equation represents a scale where what is done on one side of the scale is also done to the other side of the scale and the numbers act as constants.
text: Algebra is also a branch of mathematics that substitutes letters for numbers, replacing the unknown value with a letter.