Answer:
x = 4
BC = 20
Explanation:
From what we have, the measures EF = FG = GH
That means;
AB = CD
Thus;
5x = 2x + 12
5x - 2x = 12
3x = 12
x = 12/3
BC = AB = CD = 5(4) = 2(4) + 12 = 20
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