manipulativemist: (This is entertainment)
Kirino Ranmaru ([personal profile] manipulativemist) wrote in [community profile] inazuma11dressing 2012-06-13 05:27 pm (UTC)

It's actually pretty simple.

You need to distribute both the seven and the two to the a's and b's in parentheses, and once you've done that, combine the like terms.

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