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3x= 30-3
x= 27/3
x= 9
9+10+11= 30
número B = X+1
número C = X+2
X+X+1+X+2 = 30
3X=30-2-1
X= 27÷3
X=9
numero A= 9
numero B = 9+1 = 10
número C = 9+2 = 11