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81*(272/2)-(1/2) = 3*x // - 3*x
81*(272/2)-(3*x)-(1/2) = 0
81*(272/2)-3*x-1/2 = 0
22031/2-3*x = 0 // - 22031/2
-3*x = -22031/2 // : -3
x = -22031/2/(-3)
x = 22031/6
x = 22031/6
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