### Concept (1)

Expressions are put into their simplest form so as not to be confusing or too complex. One way of simplifying expressions is to combine like terms. By combining terms we can shorten and simplify our expressions, making them easier to read. Like terms often contain the same variable or variables.

### Sample Problems (7)

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Combine like terms:

x² + 3x + 4x² + 9 − 2x
###### Problem 1
How to simplify an expression by combining like terms.

Simplify:

3(x − 1) + 4x
###### Problem 2
How to simplify and expression by distributing and combining like terms.

Find the simplified form of the perimeter of

###### Problem 3
How to write a simplified expression for the perimeter of a triangle.
###### Problem 4
Commutative, associative, and distributive properties of real numbers
###### Problem 5
Basic overview of combining like terms, including negative coefficients
###### Problem 6
Combining like terms as simplifying when there are variables on both sides of an equation
###### Problem 7
Combining like terms within fractions in order to simplify the fractions with the order of operations