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Kaikerscupcake
Hey there! :D

We can solve for the simplest answer and see if they are equivalent. 

10a-5a= 5a

We are looking for an expression that equals 5a.

2a+3a= 5a <=== that is equivalent 

6a-4a= 2a <=== that is not equivalent

"A" is the correct answer.

I hope this helps!
~kaiker

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