You can put this solution on YOUR website! Is it (3/a) + 1 = (5/a) + 7 ??
or 3/(a+1) = 5/(a+7) ??
or something else?
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Making the problem clear and unambiguous is your responsibility.
You expect help at no charge, but you don't take the time to make the problem clear.
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PS Do not bother saying that's how it is in your book or on your homework.