Answer :

devishri1977

Answer:

Step-by-step explanation:

ΔABC ≅ ΔDEF

So, DE = AB

5x - 12 = 2x + 6

5x = 2x + 6 +12

5x = 2x +18

5x - 2x = 18

3x = 18

x = 18/3

x = 6

DE = 5x - 12 = 5*6 - 12

  = 30 - 12

DE = 18

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