?÷2+40+?÷2= 180° Solve in detail.
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Answer:
?=280
Step-by-step explanation:
(?÷2)+40+(?÷2)=180°
2(?÷2)+40=180°
2?÷4=(180-40)°
2?÷4=140°
2?=(140×4)°
2?=560°
?=560÷2
?=280
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