What is 2/3h-1/3h+11=8? How do I do that?

2/3 h - 1/3 h + 11 = 8

You could begin by combining like terms on the left side.

Notice that you have (2 of something) minus (1 of the same thing).

The things are (1/3 of 'h'). When you subtract the 1 from the 2,

what you have left there is 1/3h.

So now the equation is 1/3 h + 11 = 8

Subtract 11 from each side : 1/3 h = - 3

Multiply each side by 3 : h = - 9

2/3h - 1/3h = - 3

1/3h=-3

-9