is there some relationship between TU and SU?
If they are congruent, then just solve
3x-12 = 4x+2
Since that gives a negative value for x, I think you need to clarify things a bit.
If TU = 3x-12 and SU = 4x + 2, find the value of x. Then find the length of TU and SU.
If ST= x + 3 and TU= 4x-6, find the value of x. Then find the length of ST and TU.
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