刚刚那道题:9X-3(12-X)=84具体怎么解
问题描述:
刚刚那道题:9X-3(12-X)=84具体怎么解
答
9x - 3(12 - x) = 84
9x - 36 + 3x = 84
9x + 3x = 84 + 36
12x = 120
x = 120 ÷ 12
x = 10