A Strange Calculator

Algebra Level 2

I have a strange calculator. The four elementary calculations +,,×,÷+ , - , \times, \div are not available, but there is a button (called OMG) which has the following property: if you enter the number a,a, press OMG, and enter the number b,b, then the result shown on the screen is 1ab1-\frac{a}{b}. The change signs button and the calculator's memory are functioning normally, as are all the numbers from 0 to 9.

Is it possible to calculate the expression (2018+20192020)×20212022\frac{(2018+2019-2020)\times 2021}{2022} using the calculator only?

EDIT: You MUST only use the calculator to calculate the expression! (i.e. you must perform the calculation 2018+20192018+2019, then subtract the answer by 20202020, etc., using only buttons on the calculator). You CANNOT simplify the expression beforehand!

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