Two or more terms are similar when they have the same literal part, that is,
they have the same letters affected by the same exponents. *( Algebra, A. Baldor)*

Simplify to a single term two or more similar terms, this reduction can be done using operation of addition and subtraction or multiplication and division.

The coefficients are added or subtracted, placing in front of this addition the sign of the coefficient of bigger value and then the literal part is written.

Is the branch of mathematics that studies the quantity considered in the most general way possible

*( Algebra, A. Baldor)*

It is an equality which has at least one unknown value that must be cleared,
these unknowns values are represented by letters.

It is a representation of a rule or a general principle using letters. *( Algebra, A. Baldor)*

When describing formulas in plural, it is also valid to say "formulae".

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