Add 3 to 6, subtract w from the result, then triple what you have

[math_celebrity]

Add 3 to 6, subtract w from the result, then triple what you have

Add 3 to 6;
3 + 6

Subtract w from the result;
3 + 6 - w

Triple what you have (means multiply by 3):
3(3 + 6 - w)