Math help needed: what is the justification for the sixth step?

Mathematics
Tutor: None Selected Time limit: 1 Day

Nov 6th, 2015

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In a parallelogram opposite sides must be equal and parallel.It is the definition of parallelogram. 

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Nov 6th, 2015

what is the justifications for the fourth step

Nov 6th, 2015

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Nov 6th, 2015
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Nov 6th, 2015
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