Respuesta :

The answer is 20
3x+6x=180
9x=180 then divide
x= 20
adofoprecious9

Answer:

Therefore, x = 20

Step-by-step explanation:

Angle on a straight line is equal to 180

3x+6x=180

9x=180

Divide both sides by 9

180 divided by 9 = 20

x= 20

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