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x
x+1
x+2
entonces:
x+x+1+x+2= -18
x+x+x+1+2= -18
3x+3= -18
3x= -18-3
3x= -21
x= -21/3
x= -7
x= -7
x+1.........-7+1= -6
x+2........-7+2= -5
los numeros son: -7 , -6 , -5