Respuesta :

reinhard10158

Step-by-step explanation:

ST and RU must be equally long (as is RS and UT).

otherwise it would not be a parallelogram (with 2 pairs of parallel sides).

so,

18x - 1 = 17x

x - 1 = 0

x = 1

so, ST = RU = 18×1 - 1 = 17

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