Question

2s+s+2=5s-10

Answer 1

2s+s = ?

Answer 2

What do you get

Answer 3

3s

Answer 4

So

2s+s+2=5s-10

becomes

3s+2=5s-10

Now subtract 2 from both sides

3s+2-2=5s-10-2

3s = 5s - 12

Then subtract 5s from both sides

3s - 5s = 5s - 12 - 5s

-2s = -12

Do you see where to go from here?