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Answer:
D(x=4)
Explanation:
Because AD has to equal BC, you can make the equation
20=8x-12
then you solve it.
8x=32
x=4
For any rectangle the opposite sides are the same length.
AD = BC
8x-12 = 20
8x = 20+12
8x = 32
x = 32/8
x = 4
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