6 х + 8 х = 6 и 8 14 х 6 х – 8 х = 6 и –8 –2 х –6 х – 8 х = –6 и –8 –14 х –6 х + 8 х = –6 и 8 2х2х
х + 3 х = 1 и 3 4х4х 5 х – х = 5 и –1 4х4х – х – 7 х = –1 и –7 –8х–8х –9 х + х = –9 и 1 –8х–8х
х + х = 1 и 1 2х2х х – х = 1 и –1 0 – х – х = –1 и –1 –2х–2х – х + х = –1 и 1 0