2202-1=2=1

The correct answer is: 2201

Explanation

1. First step: $$2202-1=2201$$
2. Second step: $$2201\neq2\quad\text{and}\quad2201\neq1$$

The chain written as “2202-1=2=1” is invalid because the equal sign means the two sides must be the same number; here they are not. If you meant something else (for example arithmetic in a different base, a modular equation, or a digit-sum trick), tell me which one and I’ll explain that case.