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09-12-2018
Mathematics

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The sum of 7 times a number and 9 is 5 . Use the variable c for the unknown number.

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09-12-2018

c - the number

The sum of 7 times a number and 9 is 5:

[tex]7c+9=5[/tex] subtract 9 from both sides

[tex]7c=-4[/tex] divide both sides by 7

[tex]\boxed{c=-\dfrac{4}{7}}[/tex]

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