Answer
x = 3
Work Step by Step
We use proportions to find:
$\frac{x+1}{x} = \frac{3x-1}{2x} \\ 3x^2 -x = 2x^2 + 2x \\ x^2 -3x = 0 \\ x(x-3) = 0 \\ x = 0, 3 $
Length can't be 0, so x must equal 3.
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