12+4(3z-4)-(5z+6)= 12+ 12z - 16 - 5z - 6= 7z+12-22 =7z - 10
12+4×(3z-4)-(5z+6)= 12+ 12z - 16 - 5z - 6= 7z+12-22 =7z - 10
12+4(3z-4)-(5z+6)= 12+ 12z - 16 - 5z - 6= 7z+12-22 =7z - 10
12+4×(3z-4)-(5z+6)= 12+ 12z - 16 - 5z - 6= 7z+12-22 =7z - 10