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∠C and ​ ∠D ​ are vertical angles with m∠C=−2x+90 and m∠D=x−30 .

What is m∠D?

User Henley N
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check the picture below.
∠C and ​ ∠D ​ are vertical angles with m∠C=−2x+90 and m∠D=x−30 . What is m∠D?-example-1
User Geekscrap
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