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Solving math problems in seventh grade
Because the angle 1= angle 2, AB is parallel to CD.

Because AB is parallel to CD, angle A= angle EDC, angle C= angle ABF, because angle A= angle C, angle EDC= angle ABF.

Because angle 1= angle EDC+ angle E, angle 2= angle ABF+ angle F, angle 1= angle 2, angle EDC= angle ABF, angle E= angle F.