Question

11w-9-7w=15

Answer 1

since 11w and -7w have the same variables, you can add the coefficients (11+(-7))w
the -9 can be eliminated by adding a +9 to both sides of the equation.
To get w by itself, you have to look at what's happening to the w. Since it's being multipled to w, you can remove it by dividing that coefficient from both sides.

Answer 2

11w-9-7w=15
group like terms

Answer 3

11w - 7w = 15 + 9
4w = 24
w = 6

Answer 4

thanks i get now

Answer 5

you are welcome, mathdv. Thanks for the medal.