Respuesta :

Answer:

X=3

Step-by-step explanation:

this is a heptagon (7sides) so all the angles must add to 900 degrees

you have to add them all up

135+(5x-4)+(3x+31)+(4x+15)+(6x-8)+120+(7x-64)=900

25x+225=900

25x+225-225=900

25x=675

25x/25=675/25

x=3

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