Math Check
posted by Justine
Can you please see if you got the same answer as I did? Thank you.
3/x + 2/x4
3x12=2x
subtract 3x from both sides you get 12=1x divide by 1 final answer is 12.

Reiny
yes, the solution to 3x12=2x
is x = 12
but ...
how did 3/x + 2/x4
magically turn into the equation
3x12=2x ???? 
Justine
I multiplied each fraction by (x)(x4)

Reiny
you must have had
3/x = 2(x4)
crossmultiplying would have given you
3x  12 = 2x
ok, looks like a simple typo. 
j
3/x+ 2/x4 = 3(x4)+ 2(x)=0
3x12+2x=0
3x+2x=12
5x=12
x=125
x=7
or only if you cross multiply the 3*x4 which is 3x12 and put it equal to 2*x which is 2x that could work.
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