assert "2 * 2 + 1 == 5";
assert "2 + 2 * 3 == 8";
assert "2 * (2 + 1) == 6";
assert "2 * 2 + 1 > 4";
assert "2 * 2 + 1 > 6";
assert "2 * 2 + 1 >= 5";
assert "2 * 2 + 1 <= 5";