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If x=2, then 2 = x.
Ifx +3=y, then x=y-3.
If DE FG, then FG DE.
If XY=WZ, then XY + TU=WZ+TU.
If mz1+mz2 = 180 and mz2+ m23 = 180, then 21 23.
If 21 and 22 are vertical angles, then 21 = 22.
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:: Addition Property of Equality :: Congruent Supplement Angles
:: Subtraction Property of Equality :: Symmetric Property :: Vertical Angles Theorem
:: Reflexiv