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Seven times the sum of a number and nine is 7

I need help with this I know it's easy but I'm drawing a blank here 

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Vivian L. | Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACHMicrosoft Word/Excel/Outlook, essay comp...
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Hi Jess;
7(x+9)=7
Let's divide both sides by 7...
[7(x+9)]/7=7/7
x+9=1
Let's subtract 9 from both sides...
x+9-9=1-9
x=-8
Let's check our work...
7(x+9)=7
7(-8+9)=7
(7)(1)=7
7=7