Answer:
x = 0
Explanation:
The opposite sides of a parallelogram are congruent, that is
ST = RU , substitute values
2x + 15 = x + 15 ( subtract x from both sides )
x + 15 = 15 ( subtract 15 from both sides )
opposite sides of a parallelogram are equal
2x+15=x+15
2x-x=15-15
x=0
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