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1/((1/(10+10+10))+1/(x*1*10^-3)+(1/(x*(5/2)*10^-6)))=0 equation

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Numerical solution:

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The solution

You have entered [src]
                    1                        
----------------------------------------- = 0
                        1          1         
0.0333333333333333 + ------- + ----------    
                     x*0.001   x*5           
                               ---*1.0e-6    
                                2            
$$\frac{1}{\left(0.0333333333333333 + \frac{1}{0.001 x}\right) + \frac{1}{1.0 \cdot 10^{-6} \frac{5 x}{2}}} = 0$$
The graph
Sum and product of roots [src]
sum
0
$$0$$
=
0
$$0$$
product
1
$$1$$
=
1
$$1$$
1