Could you help me with this math question please?

SAT_Questions
Sat, 24 May 2008 18:05:56 +0000

when you isolate x, you should get 6+(18/r)=x
Starting at the step where the 2 pi is canceled out:
1.6/r = x/(r+3)
2.6(r+3)=x(r)
3.6r+18=x(r)
4.(6r/r)+(18/r)=x
5.6+(18/r)=x

As you can see that is not an answer choice.