Question 360084
-4c - 11 = 4c + 21 | +4c on both side does not change the equation (since reported on the same side, will give _ +4c-4c=0 added)
 
-11 = 8c + 21    | -21
 
-11 - 21 = 8c
 
-32 = 8c  | divide by 8 on both side
 
-4 = c