x+ x+1+x+2=2x
So 3x+3=2x
and x=-3
Check:
-3,-2,-1 are the integers.
There sum is -6 which is twice -3
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They are 14, 16 and 18.
9 and 10 9 + 2(10) = 29
9, 11, and 139 + 2(11) + 3(13) = 9 + 22 + 39 = 70
18, 20 and 22
-10 and -11.