Answer
$3x+3$
Work Step by Step
An integer has a value of exactly 1 less than its next consecutive integer. And each following consecutive integer will be exactly 1 more in value than the previous integer.
$x+(x+1)+(x+1+1)=(x+x+x)+(1+1+1)=3x+3$
Answer check: x=2
$2+3+4=3x+3=3\times2+3=9$