2-3(m-1)=2

问题描述:

2-3(m-1)=2

2-3(m-1)=2
2-3m-3(-1)=2
2-3m+3=2
2-3m+3+(3m-2)=2+(3m-2)
2-3m+3+3m-2=2+3m-2
3=3m
1=m