12-3(9-x)=5(x-4)-7(7-x)的解

问题描述:

12-3(9-x)=5(x-4)-7(7-x)的解

12-3(9-x)=5(x-4)-7(7-x)
12-27+3x=5x-20-49+7x
3x-5x-7x=-20-49+27-12
-9x=-54
x=6