1) -(m-3n)=3n-m
-m+3n=3n-m
-m+3n-3n+m=0
0=0
2) 7(2-p)+7p=14
14-7p+7p=14
14=14
3) 5a=3(a-4)+2(a+6)
5a=3a-12+2a+12
5a=5a
4) 4(m-3)+3(m+3)=7m-3
4m-12+3m+9=7m-3
7m-3+7m-3
1) -(m-3n)=3n-m
-m+3n=3n-m
-m+3n-3n+m=0
0=0
2) 7(2-p)+7p=14
14-7p+7p=14
14=14
3) 5a=3(a-4)+2(a+6)
5a=3a-12+2a+12
5a=5a
4) 4(m-3)+3(m+3)=7m-3
4m-12+3m+9=7m-3
7m-3+7m-3