What equal 23?

Answer 1

23 - 5,887 = -5,864

Answer 2

There are infinitely many possible answers.

Amongst sums are:

0+23, 1+22, 2+21, 3+20, etc

and 0.1+22.9, 1.1+21.9, 2.1+20.9, etc

and 0.01+22.99, 1.01+21.99, 2.01+20.99 etc

and so on.

Then you could include irrationals.

And then there are subtractions.

and multiplications:

1*23, 10*2.3, 100*0.23 etc

and 2*11.5, 20*1.15, 200*0.115 etc

and so on.

And divisions.

Answer 3

the equation of X=23