We want to solve for x equals 0, so it'll be useful to have this expressed as just one fraction, instead of the difference or the sum of two fractions. So what we could do is to have, we could have a common denominator, so we could multiply both the numerator and denominator of this expression by x to the fourth plus 27, and what do we get? So this is equal to, so if we multiply this first expression times x to the fourth plus 27, we get 12x squared times x to the fourth plus 27, and then in the denominator, you have x to the fourth plus 27 squared. All I did, I multiplied this numerator and this denominator by x to the fourth plus 27, I didn't change it. And then we have that second term, minus 16x to the sixth over x to the fourth plus 27 squared. The whole reason why I did that, now I have a common denominator, now I can just add the numerators. So this is going to be equal to, this is going to be equal to, let's see, let's multiply, well, the denominator, we know what the denominator is.