Respuesta :

lopezsamy777

Answer:

d

Step-by-step explanation:

to find the answer you have to set everything equal to 180

then simplify

then you get x

richchen8848

Answer:

A

Step-by-step explanation:

As the sum of angles should be 0 for a straight line, 3x+8x-20+90=180, 3x+8x-20=90

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