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9-((1/2)*x) = 121/14 // - 121/14
9-((1/2)*x)-(121/14) = 0
(-1/2)*x-121/14+9 = 0
5/14-1/2*x = 0 // - 5/14
-1/2*x = -5/14 // : -1/2
x = -5/14/(-1/2)
x = 5/7
x = 5/7
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