In the Accompanying diagram AB=AC=CD=DE and <E=1/10 <CDE <BAF in degrees Picture Attached

So this is what I figure Tirangle CDE is isos So <CDE= x and <E and <C=10x so 21x=180 but cannot use a calculator so figure number should be nicer then what get and only have 5 minutes to solve I get x to equal 8.571428571

Thanks