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steph
#1 Posted : Friday, April 20, 2012 1:39:32 AM
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1/3 X +7=12-2/3 X   WHAT IS X ?
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lisa
#2 Posted : Wednesday, May 02, 2012 3:01:25 PM
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Posts: 33

steph wrote:

1/3 X +7=12-2/3 X   WHAT IS X ?

Hi!

I'm not sure if I've understood exactly the equation you've got but if it looks like this then you solve it in the following way

\\\frac{1}{3}x+7=12-\frac{2}{3}x

what you want is to get all x:es in one side and all constants on the other. To do this we begin by subtracting 7 from both sides

\\\frac{1}{3}x+7{\color{Red} -7}=12-\frac{2}{3}x{\color{Red} -7}\\\\\\\frac{1}{3}x=5-\frac{2}{3}x

now we want to get all x:es on the same side and to do that we add 2/3x to both sides

\\\frac{1}{3}x{\color{Red} +\frac{2}{3}x}=12-\frac{2}{3}x{\color{Red} +\frac{2}{3}}x\\\\\\\frac{3}{3}x=5\\\\x=5
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