Let's look at the first one:
First step, subtract three from both sides of the inequality using the rule:
"An equal quantity may be added to, (or subtracted from) both sides of an inequality without changing the inequality"
Now we have to multiply both sides by 3 using the rule:
"An equal positive quantity may multiply (or divide) both sides of an inequality without changing the inequality."
Using the same rule above, we have to divide by 2 to isolate x:
And there you go.
Another IMPORTANT rule is this:
"If both sides of an inequality are multiplied (or divided) by a negative quantity then the inequality is reversed"
I think you can solve the other two.