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Answer :

the angles with parallel lines, are equal, this means:

and the angles A and D are congruent (opposite angles) and the same for C and B. So we can conclude, both angles we have are equal, so we can say:

7x-20=4x+16

and now we solve:

7x-4x=16+20

3x=36

x=36/3

x=12

So the answer is: x=12

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