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#include 
   
    using namespace std;//F(x) = 6*x^7+8*x^6+7*x^3+5*x^2-y*x (0 <= x <=100)#define F(x, y) (x*(x*(x*(x*(x*(x*(6*x+8)))+7)+5)-y))double solve(double l, double r, double y){
       double lm, rm;    while(r - l > 1e-7){
           lm = (2*l+r)/3;        rm = (l+2*r)/3;        if(F(lm, y)>F(rm, y))l = lm;        else if(F(lm, y)
   

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