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plz help its due today and i don't understand its asking for the measurement of angle DEF

Plz Help Its Due Today And I Dont Understand Its Asking For The Measurement Of Angle DEF class=

Answer :

WARRIORPRINCESS19GO

Step-by-step explanation:

4x+3x-5+2x+5=180 (to find x)

9x=180

x=20

Therefore DEF=AEC(vertically opposite angles are equal)

AEC=DEC

=4x +3x-5

=4(20)+3(20)-5

=135°

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