What is the answer 12x-9-3x=72
12x-9-3x=729x-9=729x-9+9=72+99x=819x/9=81/9x=9
Work:12x-9-3x=72combine like terms: 12x +(-3x)9x-9=72add 9 to both sides9x=81divide by 9 on both sidesx=9Answer:x=9