x + (x + 1) + (x + 2) = -54
x + x + 1 + x + 2 = -54
3x = -54 - 3
3x = -57
x = -57/3
x = -19
x + 1 = -19 + 1 = -18
x + 2 = -19 + 2 = -17
The numbers are = - 17, -18, -19
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