We draw a horizonal line PR and point Q somewhere on the line.
"PQ=5x-4"
"QR=x"
"PR=2x"
"PQ+QR=PR"
"5x-4+x=2x"
Solve for x
"5x+x-2x=4"
"4x=4"
"x=1"
Now we substitute the value of x in PR.
"PR=2 \\cdot 1=2"
Answer: 2.
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