I hope there's no parentheses in this equation or my answer is going to be wrong.
ALWAYS REMEMBER PEMDAS (Please Excuse My Dear Aunt Sally)
Parentheses, Exponenets, Multiply and Divide, Add and Subtract
Going in order, there's no parentheses, no exponents, so we start with multiply and divide.
9 * 9 = 81
3*-9*2=-54
2*9*-9=-162
Plug those numbers in where you took them from:
81 - (-54) + (-162)
Now you finish with adding and subtracting. I'm gonna let you do the rest on your own.