Question 207596
Set it up the same as you would if you were using 'numbers'.
You have a dividend and a divisor. Put them in  and then use the same methods of division you used for integers to grind out a quotient and, potentially, a remainder.

I'll assume the equal sign in the equation for the dividend is a typo. 

This URL is perfect for solving division questions in one variable
http://www.calc101.com/webMathematica/long-divide.jsp