I saw that online look it up
we know that
The measurement of <u>the external angle</u> is the semi-difference of the arcs which includes
so
m∠LMN=
therefore
the answer is 
Isosceles - two sides equal
2 angels the same
29 + 29 = 58
180 - 58 = 122
122 = DFE
3(x-4)(2x-3)=0
(x-4)(2x-3)=0
x=4
x=3/2