Sum of interior angles of a triangle is 180 so <PQR is 180 - 98 -15 = 67.
<PQR and <XRQ are a linear pair so they are supplementary (add up to 180), so
m<PQR + m<XQR = 180
substituting:
67 + -6x - 7 = 180
60 - 6x = 180
-6x = 120
x = -20
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