Question 162295
You'll need to a little more giving with your parens. 
I'll guess at what you mean, but without parens, I may guess wrong.
For instance on 1
Do you mean {{{W + (3/2) < 6}}} or {{{((W+3))/2 < 6}}} ???
I'll guess the latter.
{{{((W+3))/2 < 6}}} multiply both sides by 2. whatever you do to one side, you have to do to the other side
{{{W+3 < 12 }}}  subtract 3 from both sides to get W
{{{W < 9 }}}

2)
Do you mean {{{3n-8/5<=2}}} or {{{((3n-8))/5<=2}}} or is that a minus 2? on the right.

I'll assume {{{((3n-8))/5<(-2)}}}  multiply both sides by 5
{{{(3n-8)<(-10)}}} add 8 to both sides
{{{3n < -2 }}} divide both sides by 3
{{{n < (-2/3) }}}
 

Use the smae method for the last one. If you can;t get it, send me an email