1 answer:
Answer:
x = 40
Step-by-step explanation:
The sum of the angles of a triangle add to 180 degrees
x+2x+x+20 = 180
Combine like terms
4x+20 =180
Subtract 20 from each side
4x+20-20 =180-20
4x = 160
Divide each side by 4
4x/4 =160/4
x = 40
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