SOLUTION: solve for x: 12/21 = (x-5)/x A 5/9 B 11 2/3 C cannot be done

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Question 49704: solve for x: 12/21 = (x-5)/x
A 5/9
B 11 2/3
C cannot be done
Answer by pwac(253) About Me  (Show Source):
You can put this solution on YOUR website!
12%2F21+=+%28x-5%29%2Fx multiply both sides by x and 21
12x+=+21x+-+105 subtract 21x from both sides
-9x+=+-105 divide both sides by -9
x+=+%28-105%29%2F-9
x = 11 6/9 6/9 = 2/3
so answer B
x = 11 2/3
Pete