Dividing by variable when solving algebraic equation

[robvalue]

Nice

Yes, you can't legitimately divide by a variable when the variable may be zero. In such a case, you've invalidated the whole thing. So you can check for whether the variable can be zero, and then treat the case where it's not zero, so you can divide by it.

You're not getting the zero solution this way because of this. Division by zero error. 0/0 doesn't equal 1. It is undefined.