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xRetrokid · Sep 13, 2010, 02:01 PM

Im in 9th Grade this is Algebra 1 and I fell like I knew this before but I forgot completely it's the last piece of H.W I have left for today any help?

ebaines · Sep 14, 2010, 06:19 AM

Do you mean this:

(3x)9 = 12?

Combine the integers, then rearange to get x by itself::

27x = 12
x= 12/27

Unknown008 · Sep 14, 2010, 07:37 AM

Maybe this:

3x + 9 = 12

or

3x - 9 = 12

In any case, you should add/subtract/divide/multiply both sides by something in order to 'remove' numbers so that you are left with x alone.

In

$3x + 9 = 12$

Subtract 9 from both sides:

$3x + 9 - 9 = 12 - 9$

$3x = 3$

Then divide both sides by 3:

$\frac{3x}{3} = \frac{3}{3}$

$x = 1$