Take 3x + 7y - x + 12y as an example.
Collecting similar terms gives 3x - x + 7y + 12y ie 2x + 19y. Get it?
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A term.
Algebra.
A variable in algebra is an unknown quantity as for example in the term 5y the variable is y
In geometry, supplementary angles add to 180 degrees. The term 'supplementary number' is not used in algebra.
The history of algebra can be traced all the way back to the Ancient Babylonians. The term algebra is first found in a book written by Mohammed ibn Musa al-Khwarizmi.