Question

{560:(78-c)+790} :7 =6x5x4-6

Answer 1

{560:(78-c)+790} :7 = 6 x 5 x 4 - 6
{560:(78-c)+790} :7 =  120 - 6
{560:(78-c)+790} :7 = 114 
560:(78-c)+790 = 114 x 7 
560:(78-c)+790 = 798
560:(78-c) = 798-790
560:(78-c)= 8
78-c = 560:8
78-c = 70
c=78-70
c=8