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Veseljchak [2.6K]
3 years ago
13

Find the value of x for which ABCD must be a parallelogram.

Mathematics
2 answers:
trapecia [35]3 years ago
6 0
X=1
This is because 18 - 4*1 = 7*1 +7 

sp2606 [1]3 years ago
3 0
18-4x=7x+7
11-4x=7x
11=11x
x=1
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