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OpenStudy (anonymous):
a certain number decreased by 7 multiplied by the sum of the number and 7. the product is 51. find the number.
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OpenStudy (anonymous):
http://openstudy.com/groups/mathematics#/groups/mathematics/updates/4e1594c40b8b62a9006eb202
jhonyy9 (jhonyy9):
51=17x3
OpenStudy (anonymous):
(x-7)(x+7)= 51 x^2 - 49 = 51 x^2 = 100 x = 10, -10
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