You post an equation using numbers and symbols (+,-,*,/) and the = will be in the 5th,6th, or 7th position.
One approach is to cover everything with your 1st two guesses such as:
2*3+4=10
96/8-5=7
That will eliminate unused numbers and ops and tell you where the = is.
You may have to find repeated numbers and ops, and get the right order, but it will be a lot easier.
If you keep playing, you'll probably develop your own strategy.