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Can you help me? i don’t understand

Can you help me? i don’t understand-example-1
User SEU
by
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1 Answer

4 votes

angle1 + angle2 = 180


4x + 20 + x + 20 = 180


5x + 40 = 180


5x = 180 - 40


5x = 140


x = (140)/(5)


x = 28

User Sergei Rybalkin
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