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 2 х 2 х
х + 3 х = 1 и 3 4 х 4 х 5 х – х = 5 и –1 4 х 4 х – х – 7 х = –1 и –7 –8 х–8 х –9 х + х = –9 и 1 –8 х–8 х
х + х = 1 и 1 2 х 2 х х – х = 1 и –1 0 – х – х = –1 и –1 –2 х–2 х – х + х = –1 и 1 0