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

Răspuns :

{560: (78-c)+790} : 7 = 6x5x4-6
{560:(78-c)+790} : 7 = 120-6
{560:(78-c)+790} : 7 = 114
560:(78-c)+790 = 114 ×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