Distribute
(3/4)(4c)+(3/4)(16)=2c/9
3c+12=2/9 c
Now subtract 2/9 c from both sides
3c+12-2/9 c=2/9 c-2/9 c
25/9 c+12 =0
Now we need to subtract 12 from both sides
25/9 c+12-12=0-12
25/9 c=-12
Just multiply both sides by 9/25 so we find the value for c
25/9 *(25/9 c)=-12(9/25)
c= -108/25
I hope that's help:0