9. 3 1/4 x - 4 5/7 = 3 5/12 x - 3 3/14

13/4 x - 33/7 = 41/12 x - 45/14
13/4 x - 41/12 x = 33/7 - 45/14
39/12 x - 41/12 x = 66/14 - 45/14
-2/12 x = 21/14
-1/6 x = 3/2
x = (3/2) * (-6)
x = -9