From the information given, we have no idea, and no way to calculate it.
Could there possibly be another piece of information that was left out of the question ?
Such as perhaps the sum of the two angles ?
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It can have any value at all. A definite value can be determined if the polygon is regular, but there is no justification for assuming that to be the case.
A picture would help. If I've reconstructed it correctly, it appears that RSU is a 90 degree angle and UST is a 45. That means that 1/2(7x - 10) = 3x + 15 x = 40
Total 1440o; if regular, each angle = 144o
10
-10 + 4 = -6