public const int a = 6378137;
public const double f = 1 / 298.257222101;
public const double lowerLatitude = 49.8333333 * Mathf.Deg2Rad;
public const double upperLatitude = 51.1666667 * Mathf.Deg2Rad;
public const double originLatitude = 50.797815 * Mathf.Deg2Rad;
public const double originLongitude = 4.359215833 * Mathf.Deg2Rad;
public const int originX = 649328;
public const int originY = 665262;

public static double Excentricity {get => System.Math.Sqrt((2 * f) - (f * f));}

static double MLower { get => M(lowerLatitude);}
static double MUpper { get => M(upperLatitude);}

static double M(double latitude)
{
    return System.Math.Cos(latitude) / System.Math.Sqrt(1 - (Excentricity * Excentricity * System.Math.Pow(System.Math.Sin(latitude), 2)));
}

static double TLower { get => T(lowerLatitude); }
static double TUpper { get => T(upperLatitude); }
static double TOrigin { get => T(originLatitude); }

static double T(double latitude)
{

    return System.Math.Tan(Mathf.PI / 4 - latitude / 2) / System.Math.Pow((1 - Excentricity * System.Math.Sin(latitude)) / (1 + Excentricity * System.Math.Sin(latitude)), Excentricity / 2);
}

static double N { get => (System.Math.Log(MLower) - System.Math.Log(MUpper)) / (System.Math.Log(TLower) - System.Math.Log(TUpper)); }

static double G { get => MLower / (N * System.Math.Pow(TLower, N)); }

static double ROrigin { get => R(TOrigin); }

static double R (double t)
{
    return a * G * System.Math.Pow(t, N);
}

public static Vector2 FromGeographicRelative(Vector2 coordinates)
{

    double t = T((double)coordinates.x * Mathf.Deg2Rad);
    double r = R(t);
    double angle = N * ((double)coordinates.y * Mathf.Deg2Rad - originLongitude);
    Vector2 lambertCoord = new Vector2
    {
        x = (float) (r * System.Math.Sin(angle)),
        y = (float) (ROrigin - r * System.Math.Cos(angle))
    };
    return lambertCoord;

}

if (((condition1 && condition2) || (condition3 && condition4)) && condition5) { ... }

if ((MyFirstCondition() || MySecondCondition()) && MyLastCondition()) { ... }