Demarco wants to find the angle measures of this parallelogram. He knows that the first step is to find the value of x. Which of these equations will result in the correct value of x?
A. x + 15 = 6x + 4
B. 7x - 19 + 2x - 8 = 180
C. 7x - 19 = x + 15
D. 6x + 4 + 7x - 19 = 180
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