x=1/6x+1/12x+1/7x+1/2x+5+4 答案是84,怎么算的?

问题描述:

x=1/6x+1/12x+1/7x+1/2x+5+4 答案是84,怎么算的?

x=14/84x+7/84x+12/84x+42/84x+5+4
x=75/84x+5+4
x-75/84x=9
9/84x=9
x=9*84/9
x=84