Help me solve the math problem of senior one ~

The rule is: (2n+ 1) square -(2n+ 1-2) square =8n.

The square of 20065438 +0- 1999 =8x 1000.

The sum of the first number itself is equal to the first number in the formula (not square), the subtraction of two is equal to the second number (not square), and finally it is equal to eight times the first number.

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