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If 3x=9x-15 then x + 5=?

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medausza | Student, College Freshman | eNotes Newbie

Posted August 15, 2011 at 12:21 AM via web

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If 3x=9x-15 then x + 5=?

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giorgiana1976 | College Teacher | Valedictorian

Posted August 15, 2011 at 12:24 AM (Answer #1)

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We need to determine the value of x to find out what is the result of the sum x + 5.

For this reason, we'll solve the given equation.

We'll isolate the terms in x to the left side:

3x - 9x = -15

-6x = -15

We'll divide by -6 both sides:

x = -15/-6

x = 5/2

Now, we'll perform the addition:

x + 5 = 5/2 + 5

x + 5 = (5 + 2*5)/2

x + 5 = 15/2

The result of the sum x + 5 is 15/2.

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