Answer and Step-by-step explanation:
Well, Let's refer to the attachment shall we?
The first attachment is for 
And the second attachment is for 
And the third attachment is for when you combine them together.
Now it's up to you which graph suites best? You will get your answer by referring it with my graph.
Hope this will help you!
X+x-1+x-2=267
3x-3=267
3x=270
X=90 90+90-1+90-2=267
90+89+88=267
Three integers 88,89,90
the answer is even number.