You can put this solution on YOUR website! without parentheses you do exponentiation first, then mult / div then + / -
so equation as shown is 3^2 / (1/3) + 3 * 6.
doing exponentiation first becomes 9 / (1/3) + 3 * 6.
doing mult/div next then becomes 27 * 18.
doing add/subtract next then becomes 45.
i don't see 21 as being a possible answer.