Demonstratie irefutabila:
Fie
a + b = c
De unde
4a – 3a + 4b – 3b = 4c – 3c
4a + 4b – 4c = 3a + 3b – 3c
4 (a + b – c) = 3 (a + b – c)
4 = 3
Q.E.D

Astept contraziceri.
Danke, Tudor