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What is the missing reason for the 5th step in the proof below?
A: Substitution
B: Simplification of equation from previous step
C: Definition of linear pair
D: Definition of complementary angles

What is the missing reason for the 5th step in the proof below A Substitution B Simplification of equation from previous step C Definition of linear pair D Defi class=

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Answer: B

Step-by-step explanation:

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