Question 1171427
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The long way is to write an equation

    n + (n+1) + (n+2) = -54 


and then to solve it.



The short way is to know that the middle number in this situation is   {{{1/3}}}  of -54, which is -18,

so the numbers are  -19, -18  and  - 17.    <U>ANSWER</U>
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Solved, answered and explained.