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-arctg(2*x)-arctg(x)-0,08*x+pi=0 equation

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                       2*x         
-atan(2*x) - atan(x) - --- + pi = 0
                        25         
$$\left(- \frac{2 x}{25} + \left(- \operatorname{atan}{\left(x \right)} - \operatorname{atan}{\left(2 x \right)}\right)\right) + \pi = 0$$
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Numerical answer [src]
x1 = 4.30161974780675
x1 = 4.30161974780675