Envision Math 2.0: Grade 6, Volume 1
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7. Simplify Algebraic Expressions
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Exercise 6 Page 164

Remember, only like terms can be combined.

4x

Practice makes perfect
The first step in simplifying this expression is to identify which, if any, terms can be combined. Remember, only like terms — constant terms or terms with the same variable — can be combined. x+x+x+x In this case, we have four x-terms. To simplify the expression we will rearrange it according to the Distributive Property to combine the like terms.
x+x+x+x
1x+1x+1x+1x
(1+1+1+1)x
4x