How can 3.7 = X+(-5) be solved for x in one step?
O Add 3.7 to both sides.
O Add 5 to both sides.
O Subtract 3.7 from both sides
O Subtract 5 from both sides

Given: ae ≅ ce ; de ≅ be prove: abcd is a parallelogram. we have that ab || dc. by a similar argument used to prove that △aeb ≅ △ced, we can show that △ ≅ △ceb by. so, ∠cad ≅ ∠ by cpctc. therefore, ad || bc by the converse of the theorem. since both pair of opposite sides are parallel, quadrilateral abcd is a parallelogram.