The diagram of the line segment, SU is shown below.
Looking at the diagram, we can see that
ST + TU = SU
This means that
4x - 3 + 2x = 5x
4x + 2x - 5x = 3
x = 3
Substituting x = 3 into Tu = 2x,
TU = 2 * 3 = 6
The numerical length of TU is 6
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