static double sum ( double a , double b , double c , double d , double x ) {
  double ans = ( x * ( a + b ) * ( c - d ) ) / ( ( a * d ) - ( b * c ) ) ;
  return ans ;
}

static double sum ( double a , double b , double c , double d , double x ) { double ans = ( x * ( a + b ) * ( c - d ) ) / ( ( a * d ) - ( b * c ) ) ; return ans ; }
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