You may divide by a variable. But only if you know the variable is non-zero. So, if setting the variable to zero makes both sides of the equation zero, we have a solution that that variable is 0, or the equation with the variable divided out holds. E.g. solve x(x-1) = 0. you wecomle thank me later
A medical specialty concerned especially with the ear, nose, and throat and related parts of the head and neck. This is by merriam webster I had nothing to do with this.
