Why did the house of represntatives end up deciding the election of 1800

In the election of 1800, the Federalist incumbent John Adams ran against the rising Republican Thomas Jefferson. ... Unfortunately，Jefferson and his vice-presidential running mate Aaron Burr both received the identical number of electoral votes, and the House of Representatives voted to break the tie.

for this case we have the following equation:

we apply distributive property to the terms within parentheses.

subtracting 2 on both sides of the equation:

most camps were located in the area of the general government in occupied poland