1. multiply both sides by 9/4
2. subtract 3 from both sides
Is your question
Multiply by (x+3) on both sides:
Divide by g on both sides:
Subtract 3 from both sides:
As for the domain restriction, you should know that division by zero is not allowed, so you have to restrict any values of x that will make the denominator zero.
first step, there is a 4/9 multiplying the expression with x in it, so to get rid of it, we divide by 4/9, which is the same as multiplying by 9/4. but since this is an equation, whatever we do to one side, we must do to the other, to maintain equality. so the first step is:
(the 9/4 cancels the 4/9, do you see that?)
now we have on one side, x + 3, how do we get the x by itself? what's the next step?
EDIT: geez, two times too slow.... i'm not a morning person, that's my excuse