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Let the middle integer be x.
We're given:
[tex](x-1) + x + (x+1) = -27[/tex]
Open up the brackets:
[tex]x-1 + x + x+1 = -27[/tex]
Combine like terms:
[tex]3x = -27[/tex]
Divide both sides by 3:
[tex]\dfrac{3x}{3} = \dfrac{-27}{3}[/tex]
[tex]x=-9[/tex]
The value of the middle integer is -9.