Question

6m+3=9m-15
3n -(5n-5)=35

Answer 1

6m+3=9m-15
6m-9m=-15-3
-3m=-18
3m=18
m=18:3
m=6

3n -(5n-5)=35
3n-5n+5=35
-2n=35-5
-2n=30
2n=-30
n=-30:2
n=-15

Answer 2

спасибо большое!

Answer 3

пожалуйста)

Answer 4

1) 6m+3=9m-15
6m-9m= -15-3
-3m= -18
3m=18
m=6

 2) 3n -(5n-5)=35
3n-5n+5=35
-2n=30
n= -15