Hitungan Pecahan (No input user)

public class al {

    public static void main(String[] args) {
    double x=1;
    double y=2;
    double a=0;
    double b=3;
    double c=7;
    double z=(3+4*x)/5-10*(y-5)*(a+b+c)/x+9*(4/x+(9+x)/y);
   
    System.out.println( "Nilai z adalah  "+z);
    }

}