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If ADEF is an isosceles triangle with
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If ADEF is an isosceles triangle with

If ADEF is an isosceles triangle with-example-1
User Stunti
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Since the base angles
\begin{gathered} ED=EF \\ 8x-13=5x+17 \\ 8x-5x=17+13 \\ 3x=30 \\ x=(30)/(3) \\ x=10 \end{gathered}Therefore, the value of x is 10.

User Tobiesque
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