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FindRoot

FindRoot[f,{x,x0}] searches for a numerical root of f, starting from the point x=x0.

FindRoot[lhs==rhs,{x,x0}] searches for a numerical solution to the equation lhs==rhs. 

FindRoot[{f1,f2,…},{{x,x0},{y,y0},…}] searches for a simultaneous numerical root of all the fi.

FindRoot[{eqn1,eqn2,…},{{x,x0},{y,y0},…}] searches for a numerical solution to the simultaneous equations eqni.

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