code: public Matrix3x2f translateLocal(float x, float y, Matrix3x2f dest) {
          dest.m00 = m00;
          dest.m01 = m01;
          dest.m10 = m10;
          dest.m11 = m11;
          dest.m20 = m20 + x;
          dest.m21 = m21 + y;
          return dest;
      }
docs: Pre-multiply 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>T * M</code>. So when
  transforming a vector <code>v</code> with the new matrix by using
  <code>T * M * v</code>, the translation will be applied last!
  <p>
  In order to set the matrix to a translation transformation without pre-multiplying
  it, use {@link #translation(float, float)}.
  
  @see #translation(float, float)
  
  @param x
  the offset to translate in x
  @param y
  the offset to translate in y
  @param dest
  will hold the result
  @return dest