Answer:
See the code in the Eplanation
Step-by-step explanation:
// Online C++ compiler to run C++ program online
#include <iostream>
using namespace std;
int main() {
 int firstNumber;
 int secondNumber;
 int thirdNumber;
 
 
cout<< "Enter the firstNumber: ";
cin >> firstNumber;
cout << "Enter the secondNumer: ";
cin >> secondNumber;
cout << "Enter the thirdNumber: ";
cin >> thirdNumber;
int upperbound= abs(firstNumber-secondNumber);
int lowerbound= abs(secondNumber-thirdNumber);
if (lowerbound==upperbound){
cout << "The Three Numbers are Equally spaced";
 
}
 else{
 cout << "The Three Numbers are NOT Equally spaced";
}
}