Respuesta :

pchen28

Answer:

x=3

Step-by-step explanation:

25x+57+x=45x

26x+57=45x

57=19x

x=57/19

x=3

kudzordzifrancis

ANSWER

x=3

EXPLANATION

Use the exterior angle theorem:

25x°+(57+x)°=45x°

Group similar terms,

57=45x-25x-x

19x=57

Divide both sides by 19.

x=3

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