1200/x-1200/x-40=20/60
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1200/x - 1200/(x- 40) = 1/3
3*1200[ 1/x - 1 /x-40] =1
3600[x -40 - x] =(x- 40)x
-14400 *10 =x^2 - 40x
0=x^2 -40x +144000
0 =(x -20)^2 +144000-400
accordingly this hasn't factor
3*1200[ 1/x - 1 /x-40] =1
3600[x -40 - x] =(x- 40)x
-14400 *10 =x^2 - 40x
0=x^2 -40x +144000
0 =(x -20)^2 +144000-400
accordingly this hasn't factor
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