3(x-7)-2[9-4(2-x)]=22 X-（1/3）*(X-(1/3)*(X-9))=(1/9)*(X-9)

题目

3(x-7)-2[9-4(2-x)]=22 X-（1/3）*(X-(1/3)*(X-9))=(1/9)*(X-9)

答案

3(x-7)-2[9-4(2-x)]=22
3x-21-2(9-8+4x)=22
3x-21-2-8x=22
5x=-45
x=-9
X-（1/3）*(X-(1/3)*(X-9))=(1/9)*(X-9)
x-(1/3）*(x-1/3x+3)=1/9x-1
x-(1/3）*(2/3x+3)=1/9x-1
x-2/9x-1=1/9x-1
x=0