Răspuns :
Răspuns:
91-c+3x9=6x8
91-c+3x9=48
91-c+27=48
91-c=48-27
91-c=21
91-21=c
c=70
91 - c + 3 × 9 = 6 × 8
91 - c + 27 = 48
91 - c = 48 - 27
91 - c = 21
c = 91 - 21
c = 70
91 - c + 27 = 48
91 - c = 48 - 27
91 - c = 21
c = 91 - 21
c = 70