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-19+-20+-21= -60
numero B = X+1
número C= X+2
X+X+1+X+2=-60
3X= -60-1-2
X= 63÷3
X= -21
número A= -21
numero B = -21+1= -20
numero C = -21+2 = -19
(-21)+(-20)+(-19)= -21-20-19= -60