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Question:

Which of the following expressions is equivalent to $1915_w157_h21.png$?

A $7015_w156_h18.png$
Explaination

Using the distribution property, the given expression can be rewritten as $9255_w370_h21.png$. Further simplifying results in $7121_w246_h18.png$. Finally, adding like terms yields $7015_w156_h18.png$. The other choices are incorrect because they each result from errors made when performing the necessary distribution and adding like terms.