-7x-28 because you have to get the equation to it's simplest form. to do that you need to combine like term(terms that have the same variable). in this case its x. so you take -13x and add6x x to it. you get -7x. and 28 has no other like terms so you leave it alone and your final answer is -7x-28
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An algebraic expression
The algebraic expression can be simplified to: 6 -6x
It is an algebraic expression that can be simplified to: -21x-15.
6x
It is an algebraic expression because it does not contain an equality sign.