Posted by Justine on Saturday, May 1, 2010 at 10:00pm.
yes, the solution to 3x-12=2x
is x = 12
but ...
how did 3/x + 2/x-4
magically turn into the equation
3x-12=2x ????
I multiplied each fraction by (x)(x-4)
you must have had
3/x = 2(x-4)
cross-multiplying would have given you
3x - 12 = 2x
ok, looks like a simple typo.
3/x+ 2/x-4 = 3(x-4)+ 2(x)=0
3x-12+2x=0
3x+2x=12
5x=12
x=12-5
x=7
or only if you cross multiply the 3*x-4 which is 3x-12 and put it equal to 2*x which is 2x that could work.
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