why is this variable not printing out properly?

[Mekire]

When I change the variable to a string the line executes properly.

That is exactly it.  You can't concatenate a string and int.

The recommended way would be to use format.  String concatenation in general is not a great technique (though often the first thing taught >.>)

var1 = 2 + 2
 
print('The result of all calculations is {} and we are done.'.format(var1))