Is this nonlinear equation solvable?

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Substitute a=xy and b=xz and solve the linear system.

Another way you can do it is by factoring out x.
 
It is giving you a solution,
<br /> y=\frac{1}{5x}\qquad z=\frac{4}{5x}<br />
In fact that is an infinite number of solutions, since x is just a free-parameter. You get this because not all of your equations are independent. In other words, one of the equations can be written as a linear combination of the other two.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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