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Mathematics 7 Online
OpenStudy (anonymous):

x/x-2+3=2/x-2

hero (hero):

I assume it is this: \[\frac{x}{x-2} + 3 = \frac{2}{x-2}\]

hero (hero):

If that is correct, then subtract \(\large \frac{x}{x-2}\) from both sides

hero (hero):

You should end up with \[3 = \frac{2}{x-2} - \frac{x}{x-2}\]

hero (hero):

Now combine fractions on the right side to get \[3 = \frac{2 - x}{x-2}\]

hero (hero):

You can re-write 3 as a fraction; Then you'll have \[\frac{3}{1} = \frac{2 - x}{x-2}\] Now all you have to do is cross multiply to get \[3(x-2) = 1(2-x)\] You should be able to finish solving for x from there.

OpenStudy (anonymous):

ah ok let me try

OpenStudy (anonymous):

but what is the number one thing i shopuld remember when doing this kind of problems

hero (hero):

Well, each problem is different and there are different ways of doing them.

hero (hero):

But I am going to make a slight change to the fraction I created above

OpenStudy (anonymous):

ok

hero (hero):

It can be re-written as: \[3 = -\frac{x-2}{x-2}\]

hero (hero):

And as we both know, anything over itself equals 1 so: \(3 = -1\) But we know that isn't true so \(3 \ne -1\)

hero (hero):

So there is no solution to this problem

OpenStudy (anonymous):

ok

hero (hero):

If you continued solving it the other way, you would get x = 2, but we can't have 2 in the denominator of the fraction.

hero (hero):

So either way, no solution.

OpenStudy (anonymous):

ok i did it i got 2 but my book says i should get no solution so it"s confusing

OpenStudy (anonymous):

why cant we have 2 in the denominator explain that please

hero (hero):

If you had 2 in the denominator, then you would have a zero denominator, which is not possible

hero (hero):

You cannot have a fraction with \(\frac{2}{0}\) or \(\frac{x}{0}\)

hero (hero):

Fractions with zero in the denominator are not defined by mathematics.

OpenStudy (anonymous):

ah ok i got you now thank you so much for your explanation and your help

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