Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 7°C. We apply continuously 177°C heat to the field 1x3
What is the temperature (rounded to whole numbers) in the field 7x0 after 75 iterations according to the Gauss-Seidel iteration

Field in the beginning

7777777777
7777777777
7777777777
7777777777
7777777777
7777777777
7777777777
7777777777
7777777777
7777777777

Field after 4 iterations (rounded after 4th iteration)

4986533221
173428181186432
47101663720128642
9027611453271510752
541107544251610853
27484230201410753
1323231915119752
71213121097642
3677765431
2334333211

Temperature in field 7x0 after 75 iterations: