the given expression is,
OT = 4x + 10
QS = 17x - 43
the given diagram is a parallelogram,
so QS = 2 x QT
17x - 43 = 2 (4x + 10 )
17x - 43 = 8x + 20
17x - 8x = 43 + 20
9x = 63
x = 63/9
x = 7
thus, the answer is x = 7
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