Question 307924
Let x = first integer 
Let x + 1 = second integer 
Let x + 2 = third integer 
x + x + 1 + x + 2 = 423 

3x + 3 = 423

3x = 423 - 3
 
3x = 420
 
x = 420/3
 
x = 140
 
Now that we know x = 140, we can find all three integers.
 
First integer = x or 140
 
Second integer = x + 1 or 141
 
Third integer = x + 2 or 142
 
Understand?