public void testMath19() {
    String ex = "a = 100; b = 500; c = 200; d = 150; e = 500; f = 800; g = 400; a-b*c*d + e*f-g";
    System.out.println("Expression: " + ex);
    assertEquals(100 - 500 * 200 * 150 + 500 * 800 - 400, testCompiledSimple(ex, new HashMap()));
  }