1/3(6c-9)=1/4(-2c+4)

1/3 (6c-9) = 1/4 (-2c+4)
(1/3) (6c) - 9/3 = (1/4) (-2c) + 4/4
6/3c - 9/3 = -2/4c + 4/4
6/3c + 2/4c = 4/4 + 9/3
2c + 1/2c = 1 + 3
5/2c = 4
c = 4 : 5/2
   = 4 x 2/5
   = 8/5