ANSWER:
x = 4
STEP BY STEP EXPLANATION:
See attachment for complete question
From the attachment, the parallelogram has two diagonals. And the diagonals of a parallelogram bisect one another.
Because 2x - 1 and 7 are opposite sides of a diagonal; We can say that:
2x - 1= 72x−1=7
Add 1 to both sides
2x - 1 + 1 = 7 + 12x−1+1=7+1
2x = 82x=8
Divide through by 2
x =4