code: public Matrix3x2d translate(double x, double y, Matrix3x2d dest) {
          double rm20 = x;
          double rm21 = y;
          dest.m20 = m00 * rm20 + m10 * rm21 + m20;
          dest.m21 = m01 * rm20 + m11 * rm21 + m21;
          dest.m00 = m00;
          dest.m01 = m01;
          dest.m10 = m10;
          dest.m11 = m11;
          return dest;
      }
docs: Apply a translation to this matrix by translating by the given number of units in x and y and store the result
  in <code>dest</code>.
  <p>
  If <code>M</code> is <code>this</code> matrix and <code>T</code> the translation
  matrix, then the new matrix will be <code>M * T</code>. So when
  transforming a vector <code>v</code> with the new matrix by using
  <code>M * T * v</code>, the translation will be applied first!
  <p>
  In order to set the matrix to a translation transformation without post-multiplying
  it, use {@link #translation(double, double)}.
  
  @see #translation(double, double)
  
  @param x
  the offset to translate in x
  @param y
  the offset to translate in y
  @param dest
  will hold the result
  @return dest