David, obviously zapman is not a very good math student.

Therefore I think that you may have misinterpreted the problems that

he wrote. Yes, the way he wrote #1 LITERALLY means

1 7 4

-- + - = --

3s 9 3s

But looking at the other problems in general, I believe that the

problem really was intended to appear as

1 7 4

- s + - = - s

3 9 3

in which he should have written it as

(1/3)s + (7/9) = (4/3)s

So, your "multiply through by 3s" is not what zapman should do.

One of my pet peeves that students in my class complain about

is that I don't allow them to slant the fraction bars and also I

don't allow them to write the variable in the "middle".

The way that I would require a student in my class to write

1 7 4

- s + - = - s

3 9 3

is

1s 7 4s

-- + - = --

3 9 3

telling them that they don't need to write the "1" if it bothers them.

Of course, as they 'mature' in math, they can write the problem out

however they want but if they are in my class (I teach in High

School), they are NOT that 'mature' yet! Sometimes I have some

advanced students that I do let slide by.

quote:

*Originally posted by David*

1. Get rid of fractions. Multiply through by 3s.

2. Expand brackets then collect like terms.

3. Multiply through by 7.

4. Expand brackets and collect like terms.

5. Multiply through by 10q.

6. ...is incorrect.

If you can't really start on any of these you need to talk to your teacher or get a tutor. So far as I know, people here __help__, but don't do your work for you.